Bump python-dateutil from 2.5.3 to 2.8.1 (nficano#292)

Bumps [python-dateutil](https://github.com/dateutil/dateutil) from 2.5.3 to 2.8.1.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.5.3...2.8.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

Pipfile

@@ -21,7 +21,7 @@ click = "==6.6"
 docutils = "*"
 jmespath = "==0.10.0"
 pyaml = "==15.8.2"
-python-dateutil = "==2.5.3"
+python-dateutil = "==2.8.1"
 PyYAML = "==5.1"
 
 [pipenv]