Bump cratedb-toolkit[testing] in /testing/testcontainers/python-unittest

Bumps [cratedb-toolkit[testing]](https://github.com/crate/cratedb-toolkit) from 0.0.15 to 0.0.18.
- [Release notes](https://github.com/crate/cratedb-toolkit/releases)
- [Changelog](https://github.com/crate/cratedb-toolkit/blob/main/CHANGES.md)
- [Commits](crate/cratedb-toolkit@v0.0.15...v0.0.18)

---
updated-dependencies:
- dependency-name: cratedb-toolkit[testing]
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

testing/testcontainers/python-unittest/requirements.txt

@@ -1,2 +1,2 @@
 crash==0.31.5
-cratedb-toolkit[testing]==0.0.15
+cratedb-toolkit[testing]==0.0.18