Update dependency httpx to ^0.27.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
httpx (changelog)	^0.26.0 -> ^0.27.0

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Release Notes

encode/httpx (httpx)

### [`v0.27.0`](https://togithub.com/encode/httpx/blob/HEAD/CHANGELOG.md#0270-21st-February-2024) [Compare Source](https://togithub.com/encode/httpx/compare/0.26.0...0.27.0) ##### Deprecated - The `app=...` shortcut has been deprecated. Use the explicit style of `transport=httpx.WSGITransport()` or `transport=httpx.ASGITransport()` instead. ##### Fixed - Respect the `http1` argument while configuring proxy transports. ([#​3023](https://togithub.com/encode/httpx/issues/3023)) - Fix RFC 2069 mode digest authentication. ([#​3045](https://togithub.com/encode/httpx/issues/3045))

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