chore(deps): update dependency python-gitlab to v6.4.0 (#6243)

Author: renovate[bot]

.config/python/dev/requirements.txt

@@ -24,7 +24,7 @@ pytest-cov==7.0.0
 pytest-timeout==2.4.0
 pytest-xdist==3.8.0
 pytest-rerunfailures==16.0.1
-python-gitlab==6.3.0
+python-gitlab==6.4.0
 python-multipart==0.0.20
 pyyaml==6.0.3
 redis==6.4.0