Remove the usage of assertRaisesRegexp unit test alias removed in Python 3.12

Upstream-PR: https://github.com/wolever/parameterized/pull/169

diff --git a/parameterized/test.py b/parameterized/test.py
index 6c71f79..498c591 100644
--- a/parameterized/test.py
+++ b/parameterized/test.py
@@ -35,7 +35,7 @@ def assert_raises_regexp_decorator(expected_exception, expected_regexp):
     def func_decorator(func):
         @wraps(func)
         def wrapper(self, *args, **kwargs):
-            with self.assertRaisesRegexp(expected_exception, expected_regexp):
+            with self.assertRaisesRegex(expected_exception, expected_regexp):
                 func(self, *args, **kwargs)
 
         return wrapper