build(deps-dev): bump testcontainers in /clients/python

Bumps [testcontainers](https://github.com/testcontainers/testcontainers-python) from 4.5.0 to 4.6.0.
- [Release notes](https://github.com/testcontainers/testcontainers-python/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-python/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-python@testcontainers-v4.5.0...testcontainers-v4.6.0)

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

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