Bump python-dateutil from 2.9.0 to 2.9.0.post0

Bumps [python-dateutil](https://github.com/dateutil/dateutil) from 2.9.0 to 2.9.0.post0.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.9.0...2.9.0.post0)

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

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

requirements.txt

@@ -324,7 +324,7 @@ pytest-cov==4.1.0
 pytest-mock==3.12.0
 pytest-rerunfailures==13.0
 pytest-xdist==3.5.0
-python-dateutil==2.9.0
+python-dateutil==2.9.0.post0
     # via
     #   jupyter-client
     #   matplotlib