mypy: Fix errors with release >= v0.900

requirements-test.txt

@@ -4,3 +4,7 @@ requests_mock
 swh-core[testing]
 swh-scheduler[testing] >= 0.5.0
 swh-storage[testing] >= 0.10.6
+types-click
+types-python-dateutil
+types-pyyaml
+types-requests

swh/__init__.py

-# Copyright (C) 2016-2020  The Software Heritage developers
+# Copyright (C) 2016-2021  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from pkgutil import extend_path
-from typing import Iterable
+from typing import List
 
-__path__: Iterable[str] = extend_path(__path__, __name__)
+__path__: List[str] = extend_path(__path__, __name__)

swh/loader/__init__.py

-# Copyright (C) 2016-2020  The Software Heritage developers
+# Copyright (C) 2016-2021  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from pkgutil import extend_path
-from typing import Iterable
+from typing import List
 
-__path__: Iterable[str] = extend_path(__path__, __name__)
+__path__: List[str] = extend_path(__path__, __name__)