build(deps): bump openmldb from 0.8.3 to 0.8.4

Bumps [openmldb](https://github.com/4paradigm/OpenMLDB) from 0.8.3 to 0.8.4.
- [Release notes](https://github.com/4paradigm/OpenMLDB/releases)
- [Changelog](https://github.com/4paradigm/OpenMLDB/blob/main/CHANGELOG.md)
- [Commits](4paradigm/OpenMLDB@v0.8.3...v0.8.4)

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

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