Bump version numbers for 1.2.15 release.

3 jobs for alpha-1.2.15 in 15 minutes and 47 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #7455
test

00:09:33

 
  Optional Tests
passed #7456
pre_release_tests

00:05:58

 
  Check Reproducibility
passed #7457
test_reproducible

00:00:16