production: Deploy swh.loader.mercurial v2.1.0

• Upgrade swh.storage to the latest
• Restart storage services
• Upgrade workers and restart the services swh-worker@loader_mercurial and swh-worker@loader_high_priority.

At the end of it all though, the final production check end-to-end for mercurial origin should go green.

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Migrated from T3448 (view on Phabricator)