future first: switch the order of some if statements (#5206)

Since we're adding this to our contribution guidelines in
https://github.com/python/typeshed/pull/5205

stdlib/calendar.pyi

@@ -76,14 +76,14 @@ class HTMLCalendar(Calendar):
         cssclass_year: str
         cssclass_year_head: str
 
-if sys.version_info < (3, 0):
-    class TimeEncoding:
+if sys.version_info >= (3, 0):
+    class different_locale:
         def __init__(self, locale: _LocaleType) -> None: ...
         def __enter__(self) -> _LocaleType: ...
         def __exit__(self, *args: Any) -> None: ...
 
 else:
-    class different_locale:
+    class TimeEncoding:
         def __init__(self, locale: _LocaleType) -> None: ...
         def __enter__(self) -> _LocaleType: ...
         def __exit__(self, *args: Any) -> None: ...