mpl: replace deprecated all_backends (#160)

* mpl: replace deprecated all_backends

* changelog

Author: mathause

CHANGELOG.md

@@ -22,6 +22,8 @@
 
 ### Internal changes
 
+- Replace deprecated `matplotlib.rcsetup.all_backends` with `matplotlib.backends.backend_registry.list_builtin()`
+  ([#160](https://github.com/mpytools/mplotutils/pull/160)).
 
 ## v0.6.0 (04.12.2024)
 

mplotutils/tests/test_get_renderer.py

@@ -6,7 +6,7 @@
 from . import figure_context, restore_backend
 
 
-@pytest.mark.parametrize("backend", matplotlib.rcsetup.all_backends)
+@pytest.mark.parametrize("backend", matplotlib.backends.backend_registry.list_builtin())
 def test_get_renderer(backend):
 
     with restore_backend(backend):