unittest: Run ruff format over unittest.

Rather than have this change be pulled into an unrelated commit, I split
out all of the changes introduced by running `ruff format` over the
unittest codebase.

Signed-off-by: Greg Darke <micropython@me.tsukasa.au>

Author: tsukasa-au

python-stdlib/unittest/tests/test_assertions.py

@@ -92,7 +92,7 @@ def testFalse(self):
         with self.assertRaises(AssertionError):
             self.assertFalse(True)
 
-    def testIn(self): # codespell:ignore
+    def testIn(self):  # codespell:ignore
         self.assertIn("t", "cat")
         with self.assertRaises(AssertionError):
             self.assertIn("x", "cat")