Update NetAnalyzers version

eng/CodeAnalysis.ruleset

@@ -126,6 +126,7 @@
     <Rule Id="CA1844" Action="Warning" />       <!-- Provide memory-based overrides of async methods when subclassing 'Stream' -->
     <Rule Id="CA1845" Action="Warning" />       <!-- Use span-based 'string.Concat' -->
     <Rule Id="CA1846" Action="Warning" />       <!-- Prefer 'AsSpan' over 'Substring' -->
+    <Rule Id="CA1847" Action="Warning" />       <!-- Use char literal for a single character lookup -->
     <Rule Id="CA2000" Action="None" />          <!-- Dispose objects before losing scope -->
     <Rule Id="CA2002" Action="None" />          <!-- Do not lock on objects with weak identity -->
     <Rule Id="CA2007" Action="Warning" />       <!-- Consider calling ConfigureAwait on the awaited task -->

eng/Versions.props

@@ -45,9 +45,10 @@
     <MicrosoftCodeAnalysisVersion>3.8.0</MicrosoftCodeAnalysisVersion>
   </PropertyGroup>
   <PropertyGroup>
-    <MicrosoftCodeAnalysisNetAnalyzersVersion>6.0.0-preview6.21281.1</MicrosoftCodeAnalysisNetAnalyzersVersion>
+    <!-- Code analysis dependencies -->
     <MicrosoftCodeAnalysisCSharpCodeStyleVersion>3.10.0-2.final</MicrosoftCodeAnalysisCSharpCodeStyleVersion>
     <MicrosoftCodeAnalysisCSharpVersion>3.10.0-2.final</MicrosoftCodeAnalysisCSharpVersion>
+    <MicrosoftCodeAnalysisNetAnalyzersVersion>6.0.0-rc1.21320.2</MicrosoftCodeAnalysisNetAnalyzersVersion>
     <!-- Arcade dependencies -->
     <MicrosoftDotNetApiCompatVersion>6.0.0-beta.21311.3</MicrosoftDotNetApiCompatVersion>
     <MicrosoftDotNetBuildTasksFeedVersion>6.0.0-beta.21311.3</MicrosoftDotNetBuildTasksFeedVersion>

src/libraries/Common/src/System/Data/Common/DbConnectionOptions.Common.cs

@@ -406,8 +406,7 @@ private static bool IsValueValidInternal(string? keyvalue)
                 bool compValue = s_connectionStringValidValueRegex.IsMatch(keyvalue);
                 Debug.Assert((-1 == keyvalue.IndexOf('\u0000')) == compValue, "IsValueValid mismatch with regex");
 #endif
-                // string.Contains(char) is .NetCore2.1+ specific
-                return (-1 == keyvalue.IndexOf('\u0000'));
+                return (-1 == keyvalue.IndexOf('\u0000')); // string.Contains(char) is .NetCore2.1+ specific
             }
             return true;
         }

src/libraries/Microsoft.Win32.Registry/src/Microsoft/Win32/RegistryKey.cs

@@ -628,8 +628,7 @@ private static string FixupName(string name)
         {
             Debug.Assert(name != null, "[FixupName]name!=null");
 
-            // string.Contains(char) is .NetCore2.1+ specific
-            if (name.IndexOf('\\') == -1)
+            if (!name.Contains('\\'))
             {
                 return name;
             }

src/libraries/System.Configuration.ConfigurationManager/src/System.Configuration.ConfigurationManager.csproj

@@ -3,6 +3,7 @@
     <TargetFrameworks>$(NetCoreAppCurrent);netstandard2.0;net461</TargetFrameworks>
     <!-- opt-out of trimming until it works https://github.com/dotnet/runtime/issues/49062 -->
     <SetIsTrimmable>false</SetIsTrimmable>
+    <NoWarn>$(NoWarn);CA1847</NoWarn>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>

src/libraries/System.Diagnostics.EventLog/src/System.Diagnostics.EventLog.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent);netcoreapp3.1-windows;netcoreapp3.1;netstandard2.0;net461</TargetFrameworks>
-    <NoWarn>$(NoWarn);CA1838</NoWarn>
+    <NoWarn>$(NoWarn);CA1838;CA1847</NoWarn>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>

src/libraries/System.Diagnostics.PerformanceCounter/src/System.Diagnostics.PerformanceCounter.csproj

@@ -2,6 +2,7 @@
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent);netcoreapp3.1-windows;netcoreapp3.1;netstandard2.0;net461</TargetFrameworks>
+    <NoWarn>$(NoWarn);CA1847</NoWarn>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>

src/libraries/System.IO.FileSystem.DriveInfo/src/System/IO/DriveInfo.UnixOrBrowser.cs

@@ -24,7 +24,7 @@ public static DriveInfo[] GetDrives()
 
         private static string NormalizeDriveName(string driveName)
         {
-            if (driveName.Contains("\0")) // string.Contains(char) is .NetCore2.1+ specific
+            if (driveName.Contains('\0'))
             {
                 throw new ArgumentException(SR.Format(SR.Arg_InvalidDriveChars, driveName), nameof(driveName));
             }

src/libraries/System.Speech/src/System.Speech.csproj

@@ -4,7 +4,7 @@
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent);netcoreapp3.1-windows;netcoreapp3.1;netstandard2.0</TargetFrameworks>
     <!-- CS0649: uninitialized interop type fields -->
     <!-- SA1129: https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3277 -->
-    <NoWarn>$(NoWarn);CS0649;SA1129</NoWarn>
+    <NoWarn>$(NoWarn);CS0649;SA1129;CA1847</NoWarn>
     <SetIsTrimmable>false</SetIsTrimmable>
   </PropertyGroup>
   <PropertyGroup>

src/tasks/AndroidAppBuilder/ApkBuilder.cs

@@ -495,7 +495,7 @@ private static string GetLatestBuildTools(string androidSdkDir)
     {
         string? buildTools = Directory.GetDirectories(Path.Combine(androidSdkDir, "build-tools"))
             .Select(Path.GetFileName)
-            .Where(file => !file!.Contains("-"))
+            .Where(file => !file!.Contains('-'))
             .Select(file => { Version.TryParse(Path.GetFileName(file), out Version? version); return version; })
             .OrderByDescending(v => v)
             .FirstOrDefault()?.ToString();