Log Message:
py-httpx: updated to 0.28.0

0.28.0 (28th November, 2024)

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](docs/advanced/ssl.md) 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.
* Review URL percent escape sets, based on WHATWG spec.
* Ensure `certifi` and `httpcore` are only imported if required.
* Treat `socks5h` as a valid proxy scheme.
* Cleanup `Request()` method signature in line with `client.request()` and \ 
`httpx.request()`.