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/smtplib.pyi

@@ -122,7 +122,7 @@ class SMTP:
     password: str
     def auth(self, mechanism: str, authobject: _AuthObject, *, initial_response_ok: bool = True) -> _Reply: ...
     @overload
-    def auth_cram_md5(self, challenge: None = ...) -> None: ...
+    def auth_cram_md5(self, challenge: None = None) -> None: ...
     @overload
     def auth_cram_md5(self, challenge: ReadableBuffer) -> str: ...
     def auth_plain(self, challenge: ReadableBuffer | None = None) -> str: ...
@@ -178,5 +178,9 @@ class LMTP(SMTP):
         ) -> None: ...
     else:
         def __init__(
-            self, host: str = ..., port: int = ..., local_hostname: str | None = ..., source_address: _SourceAddress | None = ...
+            self,
+            host: str = "",
+            port: int = 2003,
+            local_hostname: str | None = None,
+            source_address: _SourceAddress | None = None,
         ) -> None: ...