Add `--no-update`

Closes #4060

README.md

@@ -325,6 +325,7 @@ You can also fork the project on github and run your fork's [build workflow](.gi
     -h, --help                      Print this help text and exit
     --version                       Print program version and exit
     -U, --update                    Update this program to latest version
+    --no-update                     Do not update (default)
     -i, --ignore-errors             Ignore download and postprocessing errors.
                                     The download will be considered successful
                                     even if the postprocessing fails

yt_dlp/options.py

@@ -312,6 +312,10 @@ def create_parser():
         '-U', '--update',
         action='store_true', dest='update_self',
         help='Update this program to latest version')
+    general.add_option(
+        '--no-update',
+        action='store_false', dest='update_self',
+        help='Do not update (default)')
     general.add_option(
         '-i', '--ignore-errors',
         action='store_true', dest='ignoreerrors',