build(deps): bump Microsoft.CodeAnalysis.FxCopAnalyzers (#435)

Bumps [Microsoft.CodeAnalysis.FxCopAnalyzers](https://github.com/dotnet/roslyn-analyzers) from 2.9.7 to 2.9.8.
- [Release notes](https://github.com/dotnet/roslyn-analyzers/releases)
- [Changelog](https://github.com/dotnet/roslyn-analyzers/blob/master/PostReleaseActivities.md)
- [Commits](dotnet/roslyn-analyzers@v2.9.7...v2.9.8)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

src/Directory.build.props

@@ -68,7 +68,7 @@
   <ItemGroup>
     <PackageReference Include="stylecop.analyzers" Version="1.2.0-beta.113" PrivateAssets="all" />
     <PackageReference Include="Roslynator.Analyzers" Version="2.2.0" PrivateAssets="All" />
-    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.7" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.8" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>
     <AdditionalFiles Include="$(MSBuildThisFileDirectory)stylecop.json" Link="stylecop.json" />