Remove Python 3.6 branches from typeshed (#8269)

stdlib/webbrowser.pyi

@@ -7,16 +7,9 @@ __all__ = ["Error", "open", "open_new", "open_new_tab", "get", "register"]
 
 class Error(Exception): ...
 
-if sys.version_info >= (3, 7):
-    def register(
-        name: str, klass: Callable[[], BaseBrowser] | None, instance: BaseBrowser | None = ..., *, preferred: bool = ...
-    ) -> None: ...
-
-else:
-    def register(
-        name: str, klass: Callable[[], BaseBrowser] | None, instance: BaseBrowser | None = ..., update_tryorder: int = ...
-    ) -> None: ...
-
+def register(
+    name: str, klass: Callable[[], BaseBrowser] | None, instance: BaseBrowser | None = ..., *, preferred: bool = ...
+) -> None: ...
 def get(using: str | None = ...) -> BaseBrowser: ...
 def open(url: str, new: int = ..., autoraise: bool = ...) -> bool: ...
 def open_new(url: str) -> bool: ...