chore(deps): bump @grpc/grpc-js from 1.14.4 to 1.14.6 in /functions (#827)

Bumps [@grpc/grpc-js](https://github.com/grpc/grpc-node) from 1.14.4 to 1.14.6.
- [Release notes](https://github.com/grpc/grpc-node/releases)
- [Commits](https://github.com/grpc/grpc-node/compare/@grpc/grpc-js@1.14.4...@grpc/grpc-js@1.14.6)

---
updated-dependencies:
- dependency-name: "@grpc/grpc-js"
  dependency-version: 1.14.6
  dependency-type: indirect
...

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