build(deps): bump pymilvus from 2.4.7 to 2.4.9 in /backend
Bumps [pymilvus](https://github.com/milvus-io/pymilvus) from 2.4.7 to 2.4.9.
- [Release notes](https://github.com/milvus-io/pymilvus/releases)
- [Commits](https://github.com/milvus-io/pymilvus/compare/v2.4.7...v2.4.9)
---
updated-dependencies:
- dependency-name: pymilvus
dependency-type: direct:production
update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>
dependabot[bot]