py-httpx: updated to 0.23.0

0.23.0 (23rd May, 2022)

Changed

* Drop support for Python 3.6.
* Use `utf-8` as the default character set, instead of falling back to `charset-normalizer` for auto-detection. To enable automatic character set detection, see [the documentation](https://www.python-httpx.org/advanced/#character-set-encodings-and-auto-detection).

Fixed

* Fix `URL.copy_with` for some oddly formed URL cases.
* Digest authentication should use case-insensitive comparison for determining which algorithm is being used.
* Fix console markup escaping in command line client.
* When files are used in multipart upload, ensure we always seek to the start of the file.
* Ensure that `iter_bytes` never yields zero-length chunks.
* Preserve `Authorization` header for redirects that are to the same origin, but are an `http`-to-`https` upgrade.
* When responses have binary output, don't print the output to the console in the command line client. Use output like `<16086 bytes of binary data>` instead.
* Fix display of `--proxies` argument in the command line client help.
* Close responses when task cancellations occur during stream reading.
* Fix type error on accessing `.request` on `HTTPError` exceptions.

(adam)