Bump tonic from 0.12.2 to 0.12.3 (#230)

Bumps [tonic](https://github.com/hyperium/tonic) from 0.12.2 to 0.12.3.
- [Release notes](https://github.com/hyperium/tonic/releases)
- [Changelog](https://github.com/hyperium/tonic/blob/master/CHANGELOG.md)
- [Commits](hyperium/tonic@v0.12.2...v0.12.3)

---
updated-dependencies:
- dependency-name: tonic
  dependency-type: direct:production
...

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Author: dependabot[bot]