Prepare for the bugfix release

SONARKT-417 Update rules metadata

Update next version to 2.22.0 (#513)

To avoid OOMKiller increase amount of memory available for `ws_scan_t…

…ask`

SONARKT-382 Update rules metadata (#404)

Downgrade dependencies to released versions (#397)

SONARKT-358 Support on-demand plugin downloading by adding Plugin-Req…

…uiredForLanguages manifest metadata (#366)

SONARKT-356 CCT support using sonar-analyzer-commons 2.7 and sonar-pl…

…ugin-api 10.1 (#363)

SONARKT-348 - Update linter bindings (#357)

Fix quality gates: issues reported by Sonar (#331)