Updates:
- Updates nats-server from 2.10.11 to 2.10.12
What's Changed
- Remove out-of-date licenses for ruby gems by @ystros in #2498
- Remove EventMachine from nats package by @ystros in #2499
- Remove EventMachine from DNS sync scripts by @ystros in #2500
- Switch metrics server from thin to puma by @ystros in #2497
- Remove EventMachine from Health Monitor and the Director by @ystros in #2502
- Remove blobstore load test code by @aramprice in #2505
Full Changelog: v280.0.20...v280.0.21