[ticket/11112] Use https for user-visible links to phpbb.com

PHPBB3-11112
[ticket/11112] Do not change opensource.org link to https

PHPBB3-11112
Merge remote-tracking branch 'github-marc1706/ticket/11112' into prep-release-3.0.12

* github-marc1706/ticket/11112:
  [ticket/11112] Do not change opensource.org link to https
  [ticket/11112] Use https for user-visible links to phpbb.com