Release v2.1.0

What's Changed

• Add Procrastinate integration by @snopoke in #46
• chore: prep 2.1.0a1 alpha release with procrastinate support by @snopoke in #47
• fix: make procrastinate integration tests runnable in CI by @snopoke in #48
• fix(procrastinate): track periodic tasks via job_manager.defer_periodic_job by @snopoke in #49
• Library and client upgrades by @snopoke in #50
• chore: bump dev tooling and CLI deps by @snopoke in #51
• Add queue field support by @snopoke in #52

Full Changelog: v2.0.0...v2.1.0