[ticket/11671] Add phing as a dependency and upgrade deps

PHPBB3-11671
Merge remote-tracking branch 'remotes/naderman/ticket/11671' into prep-release-3.0.12

# By Nils Adermann
# Via Nils Adermann
* remotes/naderman/ticket/11671:
  [ticket/11671] Add phing as a dependency and upgrade deps
[ticket/11671] Update composer.lock

PHPBB3-11671
Merge branch 'prep-release-3.0.12' into develop-olympus

# By Nathaniel Guse (1) and Nils Adermann (1)
* prep-release-3.0.12:
  [ticket/11671] Update composer.lock
  [ticket/11671] Add phing as a dependency and upgrade deps