fix(deps): bump @grpc/grpc-js from 1.7.1 to 1.8.8

Bumps [@grpc/grpc-js](https://github.com/grpc/grpc-node) from 1.7.1 to 1.8.8.
- [Release notes](https://github.com/grpc/grpc-node/releases)
- [Commits](https://github.com/grpc/grpc-node/compare/v1.7.1...@grpc/grpc-js@1.8.8)

---
updated-dependencies:
- dependency-name: "@grpc/grpc-js"
  dependency-type: direct:production
...

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