[3.15] Test calendar.February deprecation (GH-153893) (#153919)

Test `calendar.February` deprecation (GH-153893)

Calendar related tests now check if both deprecated constants surface the proper warnings.

* extended `test_deprecation_warning` to check `constants.February` as well
(cherry picked from commit 31c81e6)

Co-authored-by: vjabuilds <77214151+vjabuilds@users.noreply.github.com>
Co-authored-by: Tomas R. <tomas.roun8@gmail.com>

Author: 3 people

Lib/test/test_calendar.py

@@ -554,6 +554,11 @@ def test_deprecation_warning(self):
             "The 'January' attribute is deprecated, use 'JANUARY' instead"
         ):
             calendar.January
+        with self.assertWarnsRegex(
+            DeprecationWarning,
+            "The 'February' attribute is deprecated, use 'FEBRUARY' instead"
+        ):
+            calendar.February
 
     def test_isleap(self):
         # Make sure that the return is right for a few years, and