[7.3.x] doc: Fix 2024 training location (#10948)

Co-authored-by: Florian Bruhin <me@the-compiler.org>

Author: github-actions[bot]

doc/en/index.rst

@@ -2,7 +2,7 @@
 
 .. sidebar:: Next Open Trainings
 
-   - `Professional Testing with Python <https://python-academy.com/courses/python_course_testing.html>`_, via `Python Academy <https://www.python-academy.com/>`_, March 5th to 7th 2024 (3 day in-depth training), Remote
+   - `Professional Testing with Python <https://python-academy.com/courses/python_course_testing.html>`_, via `Python Academy <https://www.python-academy.com/>`_, March 5th to 7th 2024 (3 day in-depth training), Leipzig/Remote
 
    Also see :doc:`previous talks and blogposts <talks>`.