Remove an old patch.

0003-TST-Ignore-deprecations-when-switching-backends.patch

@@ -1,56 +0,0 @@
-From d54cb926a832a39cee06b677203f8a3d5ff2f084 Mon Sep 17 00:00:00 2001
-From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
-Date: Sat, 18 Jul 2020 21:40:26 -0400
-Subject: [PATCH 3/3] TST: Ignore deprecations when switching backends.
-
-Otherwise, stuff like Qt4 backend cannot be tested because the
-deprecation warning will cause a failure.
-
-Signed-off-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>
----
- lib/matplotlib/testing/conftest.py | 28 ++++++++++++++--------------
- 1 file changed, 14 insertions(+), 14 deletions(-)
-
-diff --git a/lib/matplotlib/testing/conftest.py b/lib/matplotlib/testing/conftest.py
-index 563a9fc0f..391dd5d49 100644
---- a/lib/matplotlib/testing/conftest.py
-+++ b/lib/matplotlib/testing/conftest.py
-@@ -78,21 +78,21 @@ def mpl_test_settings(request):
-             style, = style_marker.args
- 
-         matplotlib.testing.setup()
--        if backend is not None:
--            # This import must come after setup() so it doesn't load the
--            # default backend prematurely.
--            import matplotlib.pyplot as plt
--            try:
--                plt.switch_backend(backend)
--            except ImportError as exc:
--                # Should only occur for the cairo backend tests, if neither
--                # pycairo nor cairocffi are installed.
--                if 'cairo' in backend.lower() or skip_on_importerror:
--                    pytest.skip("Failed to switch to backend {} ({})."
--                                .format(backend, exc))
--                else:
--                    raise
-         with cbook._suppress_matplotlib_deprecation_warning():
-+            if backend is not None:
-+                # This import must come after setup() so it doesn't load the
-+                # default backend prematurely.
-+                import matplotlib.pyplot as plt
-+                try:
-+                    plt.switch_backend(backend)
-+                except ImportError as exc:
-+                    # Should only occur for the cairo backend tests, if neither
-+                    # pycairo nor cairocffi are installed.
-+                    if 'cairo' in backend.lower() or skip_on_importerror:
-+                        pytest.skip("Failed to switch to backend {} ({})."
-+                                    .format(backend, exc))
-+                    else:
-+                        raise
-             matplotlib.style.use(style)
-         try:
-             yield
--- 
-2.25.4
-