Bumps [black](https://github.com/psf/black) from 23.1.0 to 23.3.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.1.0...23.3.0)

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Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.2.0 to 7.3.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.2.0...7.3.1)

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Co-authored-by: Zanie Adkins <michael@prefect.io>

Bumps [mkdocstrings[python-legacy]](https://github.com/mkdocstrings/mkdocstrings) from 0.19.1 to 0.22.0.
- [Release notes](https://github.com/mkdocstrings/mkdocstrings/releases)
- [Changelog](https://github.com/mkdocstrings/mkdocstrings/blob/master/CHANGELOG.md)
- [Commits](mkdocstrings/mkdocstrings@0.19.1...0.22.0)

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Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.1.5 to 9.1.15.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.1.5...9.1.15)

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* Documenting the network backend API

* Add example for working with a network backend directly

* Network backend docs

* Update docs/network-backends.md

Co-authored-by: Florimond Manca <florimond.manca@protonmail.com>

* Add 'httpcore.AnyIONetworkBackend' and 'httpcore.TrioNetworkBackend' to the API

* Add networking backends to top-level API

* httpcore.backends becomes private, since backends are available at documented top-level API now

* Justify TrioBackend over AnyIOBackend

* Rename '_backends/asyncio.py' to '_backends/anyio.py'

* Use neater join for HTTP/1.1 example

* Tweak example of working with stream directly

* Minor docs tweaks, from working through

* Minor docs tweaks, from working through

* Minor test tweak

* Link to network backends docs from 'network_stream' extension docs

* Add Networking Backend line item to the CHANGELOG

---------

Co-authored-by: Florimond Manca <florimond.manca@protonmail.com>

* Add exceptions for invalid trace callback

* Lint

* Enforce coverage

* Check if returned value is coroutine or not

* Coverage

* update changelog

* Add HTTP/2 data_stream extension

* Expose HTTP2DataStream in 'data_stream' extension.

* Remove data_stream extension

* Remove unrelated change of 'network_stream' extension

* Refactor HTTP/2 stream events

* Refactor HTTP/2 stream events

* Graceful handling of HTTP/2 GoAway frames

* Add to CHANGELOG

* Remove unneccessary getattr

* Conditional fix

* Conditional fix

Bumps [pytest-httpbin](https://github.com/kevin1024/pytest-httpbin) from 2.0.0rc1 to 2.0.0.
- [Release notes](https://github.com/kevin1024/pytest-httpbin/releases)
- [Changelog](https://github.com/kevin1024/pytest-httpbin/blob/master/release.py)
- [Commits](kevin1024/pytest-httpbin@v2.0.0rc1...v2.0.0)

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Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.3.1 to 7.4.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.3.1...7.4.0)

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Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.5.0 to 7.2.7.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](coveragepy/coveragepy@6.5.0...7.2.7)

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* Add 'AsyncShieldCancellation' context manager

* Update _synchronization.py

* Linting

* Fix docstring wording

* Add interim 'nocover' to show tests passing.

* Add failing test case for HTTP/1.1 cancellations

* Neat cleanup for HTTP/1.1 write cancellations

* Drop 'nocover' for ShieldCancellation

* Add failing test case for HTTP/1.1 cancellations during response reading

* Resolve failing test case

* Add failing test cases for cancellations on connection pools

* Resolve failing test cases

* Add failing test cases for cancellations on HTTP/2 connections

* Resolve failing test cases

* Add failing test cases for cancellations on HTTP/2 connections when reading response

* Resolve failing test cases

* Update CHANGELOG

* Fix yield behaviour

* Version 0.17.3

* Remove release date

* Sort changes by importance

* Add release date

---------

Co-authored-by: Tom Christie <tom@tomchristie.com>