swh-web: Update requirements

Related T1678

requirements-swh.txt

-swh.core >= 0.0.57
 swh.model >= 0.0.32
 swh.storage >= 0.0.140
 swh.vault >= 0.0.23

requirements-test.txt

 pytest
 pytest-django
 hypothesis
+swh.core[http] >= 0.0.61
 swh.loader.git >= 0.0.47

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T1678 is now swh-core#1678 (closed)