(deps): Bump the microsoft group in /src with 1 update

Bumps the microsoft group in /src with 1 update: [Microsoft.CodeAnalysis.CSharp](https://github.com/dotnet/roslyn).

- [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)

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

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="JetBrains.Annotations" Version="2023.3.0" />
     <PackageVersion Include="Microsoft.Build" Version="17.8.3" />
     <PackageVersion Include="Microsoft.Build.Utilities.Core" Version="17.8.3" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.4" />
     <PackageVersion Include="Microsoft.Extensions.Configuration.CommandLine" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />