build: bump version to 1.11.16, update NEWS.org

NEWS.org

@@ -82,7 +82,7 @@
  =mu4e-mu-allow-temp-file= docstring for details on how to determine this.
 
     - Maildir lists are now generated server-side; so e.g. jumping to the 'jo'
- /other/ Maildirs used to be quite slow the first time.
+ /other/ Maildirs used to be quite slow the first time, but is now very fast.
 
  ~mu4e-cache-maildir-list~ is obsolete / non-functional now.
 
@@ -90,6 +90,8 @@
       retrieval command in a buffer =*mu4e-last-update*=, = which can be useful
       for diagnosis.
 
+    - ~mu4e~ now follows Emacs' ~package~ guidelines
+
 * 1.10 (released on March 26, 2023)
 
 *** mu

meson.build

@@ -17,7 +17,7 @@
 ################################################################################
 # project setup
 project('mu', ['c', 'cpp'],
-        version: '1.11.15',
+        version: '1.11.16',
         meson_version: '>= 0.56.0',
         license: 'GPL-3.0-or-later',
         default_options : [