Update DataAnnotations NuGet (#359)

Author: josesimoes

nanoFramework.Tools.DebugLibrary.Net/nanoFramework.Tools.DebugLibrary.Net.csproj

@@ -66,7 +66,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.Extensions.Options.DataAnnotations" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Options.DataAnnotations" Version="7.0.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub">
       <Version>1.1.1</Version>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>