Fix compatibility with newer pytest versions

src/pretix/testutils/mock.py

@@ -3,8 +3,13 @@ from contextlib import contextmanager
 from pytest_mock import MockFixture
 
 
+class FakePytestConfig:
+    def getini(self, *args, **kwargs):
+        return 'False'
+
+
 @contextmanager
 def mocker_context():
-    result = MockFixture()
+    result = MockFixture(FakePytestConfig())
     yield result
     result.stopall()