changed group_access_level description as "not required"

Author: Acarnesecchi

plugins/modules/gitlab_project_members.py

@@ -100,7 +100,7 @@
       name:
         description: Id or the full path of the group to share/unshare the project with.
         type: str
-        required: true
+        required: false
       group_access_level:
         description:
           - The access level for the group.