Bump ibm-db from 3.2.3 to 3.2.4 in /docker/ibm-db2

Bumps [ibm-db](https://github.com/ibmdb/python-ibmdb) from 3.2.3 to 3.2.4.
- [Release notes](https://github.com/ibmdb/python-ibmdb/releases)
- [Changelog](https://github.com/ibmdb/python-ibmdb/blob/master/CHANGES.md)
- [Commits](ibmdb/python-ibmdb@v3.2.3...v3.2.4)

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

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