Use dnceng AzDO feed for maven

src/SignalR/clients/java/signalr/build.gradle

@@ -1,11 +1,6 @@
 buildscript {
-    repositories {
-    maven {
-      url = "https://plugins.gradle.org/m2/"
-    }
-  }
   dependencies {
-    classpath "com.diffplug.spotless:spotless-plugin-gradle:6.6.1"
+    classpath "com.diffplug.spotless:spotless-plugin-gradle:8.1.0"
   }
 }
 
@@ -24,10 +19,6 @@ allprojects {
     java {
         sourceCompatibility = 1.9
     }
-
-    repositories {
-        mavenCentral()
-    }
 }
 
 spotless {
@@ -50,7 +41,7 @@ spotless {
         replace      'Not enough space after do', 'do{', 'do {'
         replaceRegex 'Too much space after if', 'if +\\(', 'if ('
         trimTrailingWhitespace()
-        indentWithSpaces(4)
+        leadingTabsToSpaces(4)
         removeUnusedImports() // removes any unused imports
     }
 }

src/SignalR/clients/java/signalr/settings.gradle

@@ -1,2 +1,19 @@
+pluginManagement {
+    repositories {
+        maven {
+            url = 'https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-maven/maven/v1'
+        }
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode = RepositoriesMode.FAIL_ON_PROJECT_REPOS
+    repositories {
+        maven {
+            url = 'https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-maven/maven/v1'
+        }
+    }
+}
+
 rootProject.name = 'signalr'
 include 'core', 'messagepack', 'test'