DOC Fix wheel builder badge on README (scikit-learn#31409)

Co-authored-by: Loïc Estève <loic.esteve@ymail.com>

Author: Radovenchyk

README.rst

@@ -11,7 +11,7 @@
 .. |Codecov| image:: https://codecov.io/gh/scikit-learn/scikit-learn/branch/main/graph/badge.svg?token=Pk8G9gg3y9
    :target: https://codecov.io/gh/scikit-learn/scikit-learn
 
-.. |Nightly wheels| image:: https://github.com/scikit-learn/scikit-learn/workflows/Wheel%20builder/badge.svg?event=schedule
+.. |Nightly wheels| image:: https://github.com/scikit-learn/scikit-learn/actions/workflows/wheels.yml/badge.svg?event=schedule
    :target: https://github.com/scikit-learn/scikit-learn/actions?query=workflow%3A%22Wheel+builder%22+event%3Aschedule
 
 .. |Ruff| image:: https://img.shields.io/badge/code%20style-ruff-000000.svg