build: bump version to 1.14.1

New stable version:

- Improvements in documentation
- Improvements in display of attachments / MIME-parts
- Better HTML toggling
- Support MIME icons
- Bug fixes

meson.build

@@ -17,7 +17,7 @@
 ################################################################################
 # project setup
 project('mu', ['c', 'cpp'],
-        version: '1.14.1-pre3',
+        version: '1.14.1',
         meson_version: '>= 1.3.2',
         license: 'GPL-3.0-or-later',
         default_options : [
@@ -28,7 +28,7 @@ project('mu', ['c', 'cpp'],
 
 # hard-code the date here (for reproducibility); we derive the dates used in
 # e.g. documentation from this.
-mu_date='2026-04-15'
+mu_date='2026-04-27'
 
 # installation paths
 prefixdir = get_option('prefix')