Fix docker changelogs discrepancy between 2.8.3 and 2.9.0 (#38269)

Author: Taragolis

docs/docker-stack/changelog.rst

@@ -61,24 +61,16 @@ Airflow 2.9
    * Constraints used to install the image are available in "${HOME}/constraints.txt" now - you can use them
      to install additional packages in the image without having to find out which constraints you should use.
 
-   * The ``gosu`` binary was removed from the image. This is a potentially breaking change for users who relied on
-     ``gosu`` to change the user in the container. The ``gosu`` binary was removed because it was a source of
-     security vulnerabilities as it was linked against older Go standard libraries.
-
-   * The ``smtp`` provider is now included in the list of providers installed by default in the image.
-
 Airflow 2.8
 ~~~~~~~~~~~
-* 2.8.3
-
-   * Remove ``gosu`` binary from our images (#37677)
-
 * 2.8.3
 
    * The ``gosu`` binary was removed from the image. This is a potentially breaking change for users who relied on
      ``gosu`` to change the user in the container. The ``gosu`` binary was removed because it was a source of
      security vulnerabilities as it was linked against older Go standard libraries.
 
+   * The ``smtp`` provider is now included in the list of providers installed by default in the image.
+
 * 2.8.1
 
    * Fixed a discrepancy in MySQL client libraries. In 2.8.0 if not specify ``INSTALL_MYSQL_CLIENT_TYPE`` build arg