build(deps): update python-dateutil requirement from ~=2.8.0 to ~=2.8.2

Updates the requirements on [python-dateutil](https://github.com/dateutil/dateutil) to permit the latest version.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.8.0...2.8.2)

---
updated-dependencies:
- dependency-name: python-dateutil
  dependency-type: direct:production
...

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

requirements-test.txt

@@ -1,6 +1,6 @@
 mysqlclient~=2.1.0
 psycopg2-binary~=2.9.0
 sqlparse~=0.4.0
-python-dateutil~=2.8.0
+python-dateutil~=2.8.2
 tblib==2.0.0
 openapi-core~=0.16.4