[epiphany] Non-fast-forward update to branch mcatanzaro/ci-werror

[Marge Bot <marge-bot src gnome org>]

The branch 'mcatanzaro/ci-werror' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  af3e309... ci: avoid -Werror on stable branches

Commits added to the branch:

  9b8e6e9... ci: avoid -Werror on stable branches