jobs/swh-environment: Remove pip version restriction
Observed swh modules install issue has been fixed in pip 21.3.1 release.
Migrated from D6547 (view on Phabricator)
staging instance, all data can be removed at all time
Observed swh modules install issue has been fixed in pip 21.3.1 release.
Migrated from D6547 (view on Phabricator)