nuget: bump Microsoft.CodeAnalysis.CSharp and Microsoft.CodeAnalysis.Analyzers

Bumps [Microsoft.CodeAnalysis.CSharp](https://github.com/dotnet/roslyn) and [Microsoft.CodeAnalysis.Analyzers](https://github.com/dotnet/roslyn-analyzers). These dependencies needed to be updated together.

Updates `Microsoft.CodeAnalysis.CSharp` from 4.9.2 to 4.12.0
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/main/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits)

Updates `Microsoft.CodeAnalysis.Analyzers` from 3.3.4 to 3.3.4
- [Release notes](https://github.com/dotnet/roslyn-analyzers/releases)
- [Changelog](https://github.com/dotnet/roslyn-analyzers/blob/main/PostReleaseActivities.md)
- [Commits](https://github.com/dotnet/roslyn-analyzers/compare/v3.3.4...v3.3.4)

---
updated-dependencies:
- dependency-name: Microsoft.CodeAnalysis.CSharp
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Microsoft.CodeAnalysis.Analyzers
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="GtkSharp.Dependencies.osx" Version="0.0.5" />
     <PackageVersion Include="LibHac" Version="0.19.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.9.2" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
     <PackageVersion Include="Microsoft.IdentityModel.JsonWebTokens" Version="8.1.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageVersion Include="Microsoft.IO.RecyclableMemoryStream" Version="3.0.1" />