Bump python-dateutil from 2.6.0 to 2.8.2

Bumps [python-dateutil](https://github.com/dateutil/dateutil) from 2.6.0 to 2.8.2.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.6.0...2.8.2)

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -4,7 +4,7 @@ raven==6.10.0
 pyzor==1.0.0
 Pillow==8.4.0
 pygeoip==0.3.2
-python-dateutil==2.6.0
+python-dateutil==2.8.2
 langdetect==1.0.9
 PyPDF2==1.25.1
 pyspf==2.0.14 # rq.filter: ==2.0.12t