Update httpcore to 1.0.0

[pyup-bot]

This PR updates httpcore from 0.18.0 to 1.0.0.

Changelog

1.0.0

From version 1.0 our async support is now optional, as the package has minimal dependencies by default.

For async support use either `pip install 'httpcore[asyncio]'` or `pip install 'httpcore[trio]'`.

The project versioning policy is now explicitly governed by SEMVER. See https://semver.org/.

- Async support becomes fully optional. (809)
- Add support for Python 3.12. (807)

Links

• PyPI: https://pypi.org/project/httpcore
• Changelog: https://data.safetycli.com/changelogs/httpcore/