Bump mysql_async from 0.34.1 to 0.34.2

Bumps [mysql_async](https://github.com/blackbeam/mysql_async) from 0.34.1 to 0.34.2.
- [Release notes](https://github.com/blackbeam/mysql_async/releases)
- [Commits](blackbeam/mysql_async@v0.34.1...v0.34.2)

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

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