ci: version bump to 12.1.2

pubspec.yaml

@@ -1,6 +1,6 @@
 name: locale_gen
 description: Dart tool that will convert your default locale json to dart code.
-version: 12.1.1
+version: 12.1.2
 homepage: https://github.com/impaktfull/flutter_locale_gen
 environment:
   sdk: ">=3.0.0 <4.0.0"