Increase test timeouts to 60 s to aid slower architectures

Increase the test timeouts from 10 s to 60 s.  The Gentoo arch teams
have reported that the default timeout of 10 s is insufficient for
slower architectures (such as HPPA) and/or busy test systems.

Author: mgorny

lib/matplotlib/tests/test_backend_qt.py

@@ -456,7 +456,7 @@ def _get_testable_qt_backends():
         envs.append(pytest.param(env, marks=marks, id=str(env)))
     return envs
 
-_test_timeout = 10  # Empirically, 1s is not enough on CI.
+_test_timeout = 60  # A reasonably safe value for slower architectures.
 
 
 @pytest.mark.parametrize("env", _get_testable_qt_backends())

lib/matplotlib/tests/test_backend_tk.py

@@ -7,7 +7,7 @@
 
 import pytest
 
-_test_timeout = 10  # Empirically, 1s is not enough on CI.
+_test_timeout = 60  # A reasonably safe value for slower architectures.
 
 
 def _isolated_tk_test(success_count, func=None):

lib/matplotlib/tests/test_backends_interactive.py

@@ -55,7 +55,7 @@ def _get_testable_interactive_backends():
     return envs
 
 
-_test_timeout = 10  # Empirically, 1s is not enough on CI.
+_test_timeout = 60  # A reasonably safe value for slower architectures.
 
 
 # The source of this function gets extracted and run in another process, so it