Zenity 3.99.91
  2nd release candidate of the upcoming zenity 4.0, based on libadwaita/gtk4.

  Changes and bugfixes since 3.99.91 (Logan Rathbone):
  - password: Remove spurious "Warning" heading
  - password: Only fetch username buffer if username option specified
  - build: Add implicit fallthrough warnings
  - password/msg: Handle ZENITY_TIMEOUT to be in line with other
    libadwaita-based dialogs
  - filesel: Fix exit statuses for cancel and timeout
  - Cleanup 'timeout' and make it work properly for all dialogs
  - util: Maintain default timeout exit status as 5 for backwards compat;
    various cleanups
  - text: webkit2gtk-6.0 fixes
  - msg: Code cleanups
  - Translation updates:
      Artur S0 (ru)