Update version of image in changelog (apache#52135)

After rebuilding the image, git is effectively added in 3.0.2 image

Author: potiuk

docker-stack-docs/changelog.rst

@@ -34,7 +34,7 @@ the Airflow team.
        any Airflow version from the ``Airflow 2`` line. There is no guarantee that it will work, but if it does,
        then you can use latest features from that image to build images for previous Airflow versions.
 
-Airflow 3.0.3
+Airflow 3.0.2
 ~~~~~~~~~~~~~
 
   * The ``git`` binary was added to the image by default which is needed for the git provider to work.