Update dependency httpx to v0.28.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
httpx (changelog)	==0.27.2 -> ==0.28.0

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Release Notes

encode/httpx (httpx)

v0.28.0

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The 0.28 release includes a limited set of deprecations.

Deprecations:

We are working towards a simplified SSL configuration API.

For users of the standard verify=True or verify=False cases, or verify=<ssl_context> case this should require no changes. The following cases have been deprecated...

• The verify argument as a string argument is now deprecated and will raise warnings.
• The cert argument is now deprecated and will raise warnings.

Our revised SSL documentation covers how to implement the same behaviour with a more constrained API.

The following changes are also included:

• The deprecated proxies argument has now been removed.
• The deprecated app argument has now been removed.
• JSON request bodies use a compact representation. (#​3363)
• Review URL percent escape sets, based on WHATWG spec. (#​3371, #​3373)
• Ensure certifi and httpcore are only imported if required. (#​3377)
• Treat socks5h as a valid proxy scheme. (#​3178)
• Cleanup Request() method signature in line with client.request() and httpx.request(). (#​3378)

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