The current httpx doesn't support proxies arguments:

[brokenjade3000]

#561

The current httpx doesn't support proxies arguments:
https://github.com/encode/httpx/blob/master/httpx/_client.py#L239

Fixes #Enter the associated issue number.

Description

Describe your addition briefly to help the reviewers understand your contribution.

Checklist

• Check that the base branch is set to develop and not main.
• Ensure that the documentation will be consistent with the code upon merging.
• Add a line or a few lines that check the new features added.
• Ensure that unit tests pass.
  If you don't have a premium proxy, some of the tests will be skipped.
  The tests that are run should pass without raising
  MaxTriesExceededException or other exceptions.

[arunkannawadi]

Thank you for this patch that avoids the deprecated, and now removed keyword.