build: bump version to 1.12.5

New version 1.12.5

- Rework message composition; split off parts into mu4e-draft.el
  This tries harder to maintain the current buffer as expected
- This fixes e.g. emacs-report-bug handling
- New hook mu4e-compose-post-hook for tweaking what mu4e does when
  we're done with a message (after sending, cancelling, ...).
  By default, it tries to close the frame if needed, and restore
  the window configuration. See its docstring.
- Better handle forwarding of encoded messages
- Don't remove non-mu4e completion in composer
- Integrate iCalendar support with message-composition
- Handle mu4e-sent-messages-behavior correctly when it's a function
- Better support NetBSD
- Support some file systems that don't put the file type in d_type
- Improve documenation

meson.build

@@ -17,7 +17,7 @@
 ################################################################################
 # project setup
 project('mu', ['c', 'cpp'],
-        version: '1.12.4',
+        version: '1.12.5',
         meson_version: '>= 0.56.0',
         license: 'GPL-3.0-or-later',
         default_options : [