Bump System.Reflection.Metadata from 5.0.0 to 6.0.0

Bumps [System.Reflection.Metadata](https://github.com/dotnet/runtime) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: System.Reflection.Metadata
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/Microsoft.VisualStudio.Composition/Microsoft.VisualStudio.Composition.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Microsoft.VisualStudio.Validation" Version="17.0.34" />
     <PackageReference Include="System.Composition" Version="6.0.0" />
     <PackageReference Include="System.Reflection.Emit" Version="4.7.0" />
-    <PackageReference Include="System.Reflection.Metadata" Version="5.0.0" />
+    <PackageReference Include="System.Reflection.Metadata" Version="6.0.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.3" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>