Test calendar.February deprecation (#153893)

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

* extended `test_deprecation_warning` to check `constants.February` as well

Co-authored-by: Tomas R. <tomas.roun8@gmail.com>

Author: vjabuilds

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