v1.7.2

Summary

Concurrency-limited jobs now give their slot back only to the semaphore they got it from. That fixes a job that ran past its duration letting an extra job run alongside the next holder (#827). It also fixes jobs whose class goes missing during a deploy giving back a slot they never took, or keeping one they did take. Nothing needs migrating; see "Upgrading to version 1.7.2" for what to do before 2.0.

What's Changed

• Give concurrency slots back only to the semaphore they came from by @rosa in #831

Full Changelog: v1.7.1...v1.7.2