enchant-2: update to 2.2.12

The 2.2.12 version contains a bug fix useful for gspell:
gspell#10
0 jobs for master
Child pipeline (parent) yaml invalid error

Found errors in your .gitlab-ci.yml:

  • Undefined error (Mu7I5fl29Y6)
You can also test your .gitlab-ci.yml in CI Lint