build(deps): bump Microsoft.CodeAnalysis.FxCopAnalyzers (#2193)

Bumps [Microsoft.CodeAnalysis.FxCopAnalyzers](https://github.com/dotnet/roslyn-analyzers) from 2.6.3 to 2.9.6.
- [Release notes](https://github.com/dotnet/roslyn-analyzers/releases)
- [Changelog](https://github.com/dotnet/roslyn-analyzers/blob/master/PostReleaseActivities.md)
- [Commits](dotnet/roslyn-analyzers@v2.6.3...v2.9.6)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

src/Directory.build.props

@@ -74,9 +74,9 @@
 
   <ItemGroup>
     <PackageReference Include="stylecop.analyzers" Version="1.1.118" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.6.3" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.6" PrivateAssets="all" />
     <PackageReference Include="Roslynator.Analyzers" Version="2.1.0" PrivateAssets="All" />
-    <PackageReference Condition="'$(OS)' == 'Windows_NT'" Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.4" PrivateAssets="all" />
+    <PackageReference Condition="'$(OS)' == 'Windows_NT'" Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.6" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>
     <AdditionalFiles Include="$(MSBuildThisFileDirectory)stylecop.json" Link="stylecop.json" />