Add typing stubs dependencies for mypy>0.900
not for review, just to make sure it's enough to fix the build [1]
Migrated from D5839 (view on Phabricator)
Staging instance, all changes can be removed at any time
not for review, just to make sure it's enough to fix the build [1]
Migrated from D5839 (view on Phabricator)