Bump gitpython from 3.0.2 to 3.0.5

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.0.2 to 3.0.5.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/master/CHANGES)
- [Commits](https://github.com/gitpython-developers/GitPython/compare/3.0.2...3.0.5)

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

Pipfile

@@ -10,7 +10,7 @@ image = "==1.5.27"
 iris = {path = ".",editable = true}
 flaky = "==3.6.1"
 funcy = "==1.13"
-gitpython = "==3.0.2"
+gitpython = "==3.0.5"
 more-itertools = "==7.2.0"
 mozdownload = "==1.26"
 mozinfo = "==1.1.0"