Log Message:
py-urllib3: updated to 1.25.7

1.25.7:
* Preserve ``chunked`` parameter on retries
* Allow unset ``SERVER_SOFTWARE`` in App Engine
* Fix issue where URL fragment was sent within the request target.
* Fix issue where an empty query section in a URL would fail to parse.
* Remove TLS 1.3 support in SecureTransport due to Apple removing support