[Flask-Cors] Mark as obsolete since 6.0.4 and pin to 6.0.3 (#15880)

Author: github-actions[bot]

stubs/Flask-Cors/METADATA.toml

@@ -1,4 +1,5 @@
-version = "~=6.0.3"
+version = "6.0.3"
 upstream-repository = "https://github.com/corydolphin/flask-cors"
 # Requires a version of flask with a `py.typed` file
 dependencies = ["Flask>=2.0.0"]
+obsolete-since = "6.0.4" # Released on 2026-06-07