macOS: Bump the minimum required macOS version to Catalina released five years ago.

Catalina is actually already EOL as of July 2022 but we dont need
anything from newer releases that isn't detected at runtime. Going to
Catalina allows us to use a better format for the generated DMG (UMNO
instead of ULFO which compresses better).

bypy/macos/__main__.py

@@ -441,7 +441,7 @@ class Freeze(object):
         py_compile(join(self.resources_dir, 'Python'))
 
     @flush
-    def makedmg(self, d, volname, format='ULFO'):
+    def makedmg(self, d, volname, format='ULMO'):
         ''' Copy a directory d into a dmg named volname '''
         print('\nMaking dmg...')
         sys.stdout.flush()

docs/changelog.rst

@@ -136,6 +136,8 @@ Detailed list of changes
 
 - When :opt:`shell` is set to ``.`` respect the SHELL environment variable in the environment in which kitty is launched (:pull:`7714`)
 
+- macOS: Bump the minimum required macOS version to Catalina released five years ago.
+
 
 0.35.2 [2024-06-22]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

setup.py

@@ -1588,7 +1588,7 @@ def macos_info_plist() -> bytes:
         NSHumanReadableCopyright=time.strftime('Copyright %Y, Kovid Goyal'),
         CFBundleGetInfoString='kitty - The fast, feature-rich, GPU based terminal emulator. https://sw.kovidgoyal.net/kitty/',
         # Operating System Version
-        LSMinimumSystemVersion='10.12.0',
+        LSMinimumSystemVersion='10.15.0',
         # Categorization
         CFBundlePackageType='APPL',
         CFBundleSignature='????',