[v3-1-test] remove outdated note from upgrading docs (#57338) (#57345)

(cherry picked from commit b011954)

Co-authored-by: Elad Kalif <45845474+eladkal@users.noreply.github.com>

Author: github-actions[bot]

airflow-core/docs/installation/upgrading_to_airflow3.rst

@@ -61,7 +61,7 @@ Step 1: Take care of prerequisites
 ----------------------------------
 
 - Make sure that you are on Airflow 2.7 or later. It is recommended to upgrade to latest 2.x and then to Airflow 3.
-- Make sure that your Python version is in the supported list. Airflow 3.0.0 supports the following Python versions: Python 3.9, 3.10, 3.11 and 3.12.
+- Make sure that your Python version is in the supported list.
 - Ensure that you are not using any features or functionality that have been :ref:`removed in Airflow 3<breaking-changes>`.