Bump grpc-tools in the ruby group across 1 directory

Bumps the ruby group with 1 update in the / directory: [grpc-tools](https://github.com/google/grpc).


Updates `grpc-tools` from 1.69.0 to 1.70.1
- [Release notes](https://github.com/google/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/src/ruby/CHANGELOG.md)
- [Commits](grpc/grpc@v1.69.0...v1.70.1)

---
updated-dependencies:
- dependency-name: grpc-tools
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: ruby
...

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

Gemfile.lock

@@ -34,7 +34,7 @@ GEM
     grpc (1.64.3-x86_64-linux)
       google-protobuf (~> 3.25)
       googleapis-common-protos-types (~> 1.0)
-    grpc-tools (1.69.0)
+    grpc-tools (1.70.1)
     method_source (1.1.0)
     os (1.1.4)
     parser (3.3.7.0)