v1.19.4-2.1

What's Changed

• Update maintainer label by @kenhys in #534
• Update to jemalloc 5.4.0 by @kenhys in #535
• Release v1.19.4 2.1 by @kenhys in #536

Full Changelog: v1.19.4-2.0...v1.19.4-2.1