Add more defaults to the stdlib (#9606)

Continuing work towards #8988.

The first five commits were created using stubdefaulter on various Python versions; the following commits were all created manually by me to fix various problems. The main things this adds that weren't present in #9501 are:

- Defaults in Windows-only modules and Windows-only branches (because I'm running a Windows machine)
- Defaults in non-py311 branches
- Defaults for float parameters
- Defaults for overloads

stdlib/unittest/mock.pyi

@@ -408,7 +408,12 @@ if sys.version_info >= (3, 10):
 
 else:
     def create_autospec(
-        spec: Any, spec_set: Any = ..., instance: Any = ..., _parent: Any | None = ..., _name: Any | None = ..., **kwargs: Any
+        spec: Any,
+        spec_set: Any = False,
+        instance: Any = False,
+        _parent: Any | None = None,
+        _name: Any | None = None,
+        **kwargs: Any,
     ) -> Any: ...
 
 class _SpecState: