Bump python-gitlab from 2.3.1 to 2.4.0

Bumps [python-gitlab](https://github.com/python-gitlab/python-gitlab) from 2.3.1 to 2.4.0.
- [Release notes](https://github.com/python-gitlab/python-gitlab/releases)
- [Changelog](https://github.com/python-gitlab/python-gitlab/blob/master/ChangeLog.rst)
- [Commits](python-gitlab/python-gitlab@v2.3.1...v2.4.0)

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

requirements.txt

@@ -5,8 +5,8 @@ ansible==2.9.10
 docker==4.2.2
 docker-compose==1.26.2
 pyOpenSSL==19.1.0
-# python-gitlab==2.3.1
+# python-gitlab==2.4.0
 
-python-gitlab==2.3.1
+python-gitlab==2.4.0
 PyYAML==5.3.1
 boolean==1.1.0