Akuli and srittau: Remove Python 2 branches from Python 3 stubs (#5461)

* run script and do some manual changes (Akuli)

* do the whole thing manually (srittau)

* merge changes (Akuli)

Co-authored-by: Sebastian Rittau <srittau@rittau.biz>

stdlib/calendar.pyi

@@ -77,17 +77,10 @@ class HTMLCalendar(Calendar):
         cssclass_year: str
         cssclass_year_head: str
 
-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 TimeEncoding:
-        def __init__(self, locale: _LocaleType) -> None: ...
-        def __enter__(self) -> _LocaleType: ...
-        def __exit__(self, *args: Any) -> None: ...
+class different_locale:
+    def __init__(self, locale: _LocaleType) -> None: ...
+    def __enter__(self) -> _LocaleType: ...
+    def __exit__(self, *args: Any) -> None: ...
 
 class LocaleTextCalendar(TextCalendar):
     def __init__(self, firstweekday: int = ..., locale: Optional[_LocaleType] = ...) -> None: ...