chore(deps-dev): bump mysql2 in /packages/opentelemetry-node

Bumps [mysql2](https://github.com/sidorares/node-mysql2) from 3.11.5 to 3.12.0.
- [Release notes](https://github.com/sidorares/node-mysql2/releases)
- [Changelog](https://github.com/sidorares/node-mysql2/blob/master/Changelog.md)
- [Commits](sidorares/node-mysql2@v3.11.5...v3.12.0)

---
updated-dependencies:
- dependency-name: mysql2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>