Update dependency httpx to ^0.25.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
httpx (changelog)	^0.24.0 -> ^0.25.0

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Release Notes

encode/httpx (httpx)

v0.25.0

Compare Source

Removed

• Drop support for Python 3.7. (#​2813)

Added

• Support HTTPS proxies. (#​2845)
• Change the type of Extensions from Mapping[Str, Any] to MutableMapping[Str, Any]. (#​2803)
• Add socket_options argument to httpx.HTTPTransport and httpx.AsyncHTTPTransport classes. (#​2716)
• The Response.raise_for_status() method now returns the response instance. For example: data = httpx.get('...').raise_for_status().json(). (#​2776)

Fixed

• Return 500 error response instead of exceptions when raise_app_exceptions=False is set on ASGITransport. (#​2669)
• Ensure all WSGITransport environs have a SERVER_PROTOCOL. (#​2708)
• Always encode forward slashes as %2F in query parameters (#​2723)
• Use Mozilla documentation instead of httpstatuses.com for HTTP error reference (#​2768)

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