configure.ac: bump versions for the 2.10.22 release

4 jobs for GIMP_2_10_22 in 45 minutes and 51 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Dependencies
passed #925471
deps-debian/testing

00:08:48

 
  Gimp
passed #925472
gimp-debian/testing-autotools

00:19:39

passed #925473
gimp-debian/testing-autotools-distcheck

00:35:08

 
  Distribution
passed #925474
sources

00:01:53