Added a 'all_available=True' to a list

Fix for this message: "gitlab_group_fork.py:151: UserWarning: Calling a list() method without specifying get_all=True or iterator=True will return a maximum of 20 items. Your query returned 20 of 28 items. See https://python-gitlab.readthedocs.io/en/v3.12.0/api-usage.html#pagination for more details. If this was done intentionally, then this warning can be supress ed by adding the argument get_all=False to the list() call. (python-gitlab: D:/msys64/mingw64/lib/python3.10/site-packages/gitlab/client.py:972) projects = gitlab_grp.projects.list()"