Bump version -> 2.21.4

Merge pull request Col-E#411 from win32kbase/master

Fix Col-E#364

Bump version -> 2.21.2

Bump node version in CI

Update maven wrapper version

fix: Phantom annotation classes not generated properly

Invalid flags, inner classes totally busted, missing retention policy.

fix: Remove incorrect maven repo resolving logic, using default locat…

…ion instead

Bump version -> 2.20.1

Minor tidying of Col-E#381

Bump version --> 2.19.6