REQUIRES SR#1120297

- Update to 0.25.0:
  - Drop support for Python 3.7.
  - Support HTTPS proxies.
  - Change the type of Extensions from Mapping[Str, Any] to
    MutableMapping[Str, Any].
  - Add socket_options argument to httpx.HTTPTransport and
    httpx.AsyncHTTPTransport classes.
  - The Response.raise_for_status() method now returns
    the response instance. For example: data =
    httpx.get('...').raise_for_status().json().
  - Return 500 error response instead of exceptions when
    raise_app_exceptions=False is set on ASGITransport.
  - Ensure all WSGITransport environs have a SERVER_PROTOCOL.
  - Always encode forward slashes as %2F in query parameters
  - Use Mozilla documentation instead of httpstatuses.com for
    HTTP error reference
- Requires higher version of httpcore.

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