fix: invalid ref in pubspec.lock

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

pubspec.lock

@@ -932,7 +932,7 @@ packages:
     description:
       path: "."
       ref: null-safety
-      resolved-ref: "2906e65ffaa96afbe6c72e8477d4dfcdfd06c2c3"
+      resolved-ref: "a3d4020911860ff091d90638ab708604b71d2c5a"
       url: "https://github.com/TheOneWithTheBraid/keyboard_shortcuts.git"
     source: git
     version: "0.1.4"