Bump grpcio-tools from 1.48.0 to 1.48.1 in /test/environment/grpc

Bumps [grpcio-tools](https://github.com/grpc/grpc) from 1.48.0 to 1.48.1.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.48.0...v1.48.1)

---
updated-dependencies:
- dependency-name: grpcio-tools
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

test/environment/grpc/requirements.txt

@@ -1,4 +1,4 @@
-grpcio-tools==1.48.0
+grpcio-tools==1.48.1
 grpcio==1.48.0
 grpcio-reflection==1.48.0
 grpcio-health-checking==1.48.0