* Upper-bound frozendict dependency

This is an ugly kludge to solve
https://github.com/matrix-org/synapse/issues/15109. It is not the most
friendly thing to do for downstream packagers (apologies), but we are a)
running low on time at the moment, and b) seeking to remove frozendict
anyway.

* Changelog

* Bump ruff from 0.0.215 to 0.0.224

Bumps [ruff](https://github.com/charliermarsh/ruff) from 0.0.215 to 0.0.224.
- [Release notes](https://github.com/charliermarsh/ruff/releases)
- [Changelog](https://github.com/charliermarsh/ruff/blob/main/BREAKING_CHANGES.md)
- [Commits](https://github.com/charliermarsh/ruff/compare/v0.0.215...v0.0.224

)

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* Re-enable some linting

* Newsfile

* Remove comment

* Bump ruff from 0.0.206 to 0.0.215

Bumps [ruff](https://github.com/charliermarsh/ruff) from 0.0.206 to 0.0.215.
- [Release notes](https://github.com/charliermarsh/ruff/releases)
- [Changelog](https://github.com/charliermarsh/ruff/blob/main/BREAKING_CHANGES.md)
- [Commits](https://github.com/charliermarsh/ruff/compare/v0.0.206...v0.0.215

)

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ruff is a flake8-compatible Python linter written in Rust.
It supports the flake8 plugins that we use and is significantly
faster in testing.

PyYAML 3.13 fixes some issues with Python 3.7 compatibility
and was released in 2018.

Fixes #13655

This change uses ICU (International Components for Unicode) to improve boundary detection in user search.

This change also adds a new dependency on libicu-dev and pkg-config for the Debian packages, which are available in all supported distros.

The internal methods of the StreamChangeCache were inconsistently
treating the earliest known stream position as valid. It is now treated as
invalid, meaning the cache cannot determine if an entity at the earliest
known stream position has changed or not.	

This implements a fake OIDC server, which intercepts calls to the HTTP client.
Improves accuracy of tests by covering more internal methods.

One particular example was the ID token validation, which previously mocked.

This uncovered an incorrect dependency: Synapse actually requires at least
authlib 0.15.1, not 0.14.0.

* Don't pin dev-deps in pyproject; use lower bounds

This makes it slightly less tedious to update these things via
successive dependabot updates, by reducing the likelihood of a merge
conflict.

* Changelog

* Changelog