Bump System.Reflection.Metadata from 6.0.1 to 7.0.0 in /Src

Bumps [System.Reflection.Metadata](https://github.com/dotnet/runtime) from 6.0.1 to 7.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits)

---
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>

Src/ILGPU/ILGPU.csproj

@@ -51,7 +51,7 @@
     <PackageReference Include="System.Collections.Immutable" Version="6.0.0" />
     <PackageReference Include="System.Memory" Version="4.5.5" />
     <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
-    <PackageReference Include="System.Reflection.Metadata" Version="6.0.1" />
+    <PackageReference Include="System.Reflection.Metadata" Version="7.0.0" />
     <PackageReference Include="T4.Build" Version="0.2.4" PrivateAssets="All" />
   </ItemGroup>