gitlab: make url mandatory and add type

swh/lister/gitlab/lister.py

@@ -93,7 +93,7 @@ class GitLabLister(Lister[GitLabListerState, PageResult]):
     def __init__(
         self,
         scheduler,
-        url=None,
+        url: str,
         instance: Optional[str] = None,
         credentials: Optional[CredentialsType] = None,
         incremental: bool = False,

swh/lister/tests/test_cli.py

@@ -17,6 +17,7 @@ lister_args = {
         "api_token": "bogus",
     },
     "gitea": {"url": "https://try.gitea.io/api/v1/",},
+    "gitlab": {"url": "https://gitlab.ow2.org/api/v4", "instance": "ow2",},
 }