Upstream changes
- Merge branch 'bugfix/optional-alpine-mirror' into 'master'
- Fix breakage when 'ALPINE_MIRROR' is not provided.
- support optional mirror for alpine
- Merge branch 'bugfix/add-sessions-to-autoloader' into 'master'
- Add the 'Sessions' class to the autoloader.
- Merge branch 'feature/php84-session_set_save_handler' into 'master'
- Merge branch 'weblate-integration' into 'master'
- update CONTRIBUTING
- Translated using Weblate (Portuguese (Portugal))
- Translated using Weblate (Chinese (Traditional))
- Move side effects out of the 'Sessions' constructor.
- Add and use the 'Sessions' class.
- Switch to the non-deprecated form of 'session_set_save_handler'.