GIT_SILENT Update 21.12 changelog

3 jobs for v21.12 in 45 seconds (queued for 5 seconds)
latest
Status Name Job ID Coverage
  Build
passed android_qt515 #172368
Linux

00:00:22

passed freebsd_qt515 #172369
FreeBSD

00:00:27

passed suse_tumbleweed_qt515 #172367
Linux

00:00:45