Bump Grpc.Tools from 2.68.1 to 2.69.0 in /hello-grpc-csharp

Bumps [Grpc.Tools](https://github.com/grpc/grpc) from 2.68.1 to 2.69.0.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](https://github.com/grpc/grpc/commits)

---
updated-dependencies:
- dependency-name: Grpc.Tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

hello-grpc-csharp/Common/Common.csproj

@@ -12,7 +12,7 @@
     <!-- https://www.nuget.org/packages/Grpc -->
     <PackageReference Include="Grpc" Version="2.46.6" />
     <!-- https://www.nuget.org/packages/Grpc.Tools -->
-    <PackageReference Include="Grpc.Tools" Version="2.68.1" PrivateAssets="All" />
+    <PackageReference Include="Grpc.Tools" Version="2.69.0" PrivateAssets="All" />
     <!-- https://www.nuget.org/packages/log4net -->
     <PackageReference Include="log4net" Version="3.0.3" />
     <!-- https://www.nuget.org/packages/Newtonsoft.Json -->