package/python-referencing: remove runtime python-typing-extensions dependency

This reverts commit 0586ee6cba7411b2d1f6635cdfe36ab8fac791d7.

The dependency is not needed any more with package/python3 providing
3.13 (since commit d63e207eb869063f82c867658676c2903beb08cb).

Signed-off-by: Fiona Klute (WIWA) <fiona.klute@gmx.de>
[Julien: reword commit log title]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/python-referencing/Config.in

@@ -3,7 +3,6 @@ config BR2_PACKAGE_PYTHON_REFERENCING
 	depends on BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS # python-rpds-py
 	select BR2_PACKAGE_PYTHON_ATTRS # runtime
 	select BR2_PACKAGE_PYTHON_RPDS_PY # runtime
-	select BR2_PACKAGE_PYTHON_TYPING_EXTENSIONS # runtime, with Python < 3.13
 	help
 	  JSON Referencing + Python.