http.client.HTTPConnection.request accepts str as the body (#9322)

See code around https://github.com/python/cpython/blob/ab02262cd0385a2fb5eb8a6ee3cedd4b4bb969f3/Lib/http/client.py#L1328

Author: JelleZijlstra

stdlib/http/client.pyi

@@ -154,7 +154,13 @@ class HTTPConnection:
         blocksize: int = ...,
     ) -> None: ...
     def request(
-        self, method: str, url: str, body: _DataType | None = ..., headers: Mapping[str, str] = ..., *, encode_chunked: bool = ...
+        self,
+        method: str,
+        url: str,
+        body: _DataType | str | None = ...,
+        headers: Mapping[str, str] = ...,
+        *,
+        encode_chunked: bool = ...,
     ) -> None: ...
     def getresponse(self) -> HTTPResponse: ...
     def set_debuglevel(self, level: int) -> None: ...