Bump Grpc.Tools from 2.67.0 to 2.68.1 in /Source (#4368)

Bumps [Grpc.Tools](https://github.com/grpc/grpc) from 2.67.0 to 2.68.1.
- [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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Source/Csla.Channels.Grpc/Csla.Channels.Grpc.csproj

@@ -25,7 +25,7 @@
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" Version="3.29.1" />
     <PackageReference Include="Grpc.Net.Client" Version="2.67.0" />
-    <PackageReference Include="Grpc.Tools" Version="2.67.0">
+    <PackageReference Include="Grpc.Tools" Version="2.68.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>