* Upgrade to new lockfile format

Now requires poetry >= 1.2.2 to read and poetry >= 1.3.0 to write.

Cheat sheet:

```
poetry --version
poetry show > scratch/before
pipx upgrade poetry
poetry --version
poetry show > scratch/after
diff scratch{before,after} && echo "no change!"
```

* Use Poetry 1.3.2 when reading or writing lockfile

* Remove unneeded(?) poetry dep for cibuildwheel

* Update docs

* Remove redundant call to setup-python

* Remove outdated comments related to Poetry 1.x

* Remove outdated docs line

was fixed in #13082

* Minor improvements to poetry cheat sheet

* Invoke setup-python-poetry with explicit version

Not sure about this. It's hardcoding versions everywhere.

* Changelog

* Check the lockfile is version 2.0

Might one day incorporate other checks like #14742

* Typo fixes, thanks Sean

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

* Fix upgrade notes for installing ICU

As noticed in https://github.com/matrix-org/synapse/pull/14712/files#r1058433297

* Changelog

* Fix stale external links

* Fix some internal links

* Fix URLs without trailing / where needed

* Fix more links

* Newsfile

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

* Reapply docs/openid.md fix after conflict

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

Fixes #14704.

Signed-off-by: Mathieu Velten <mathieuv@matrix.org>

Remove legacy Prometheus metrics names. They were deprecated in Synapse v1.69.0 and disabled by default in Synapse v1.71.0. (#14538)

Signed-off-by: Sean Quah <seanq@matrix.org>

Disable legacy Prometheus metric names by default. They can still be re-enabled for now, but they will be removed altogether in Synapse 1.73.0. (#14353)

Check appservice user interest against the local users instead of all users (`get_users_in_room` mis-use) (#13958)

* Save login tokens in database

Signed-off-by: Quentin Gliech <quenting@element.io>

* Add upgrade notes

* Track login token reuse in a Prometheus metric

Signed-off-by: Quentin Gliech <quenting@element.io>

Deprecate the `generate_short_term_login_token` method in favor of an async `create_login_token` method in the Module API. (#13842)

Signed-off-by: Quentin Gliech <quenting@element.io>
Co-authored-by: Brendan Abolivier <babolivier@matrix.org>

Announce that legacy metric names are deprecated, will be turned off by default in Synapse v1.71.0 and removed altogether in Synapse v1.73.0. (#14024)

* Update upgrade notes

* Synapse Synapse Synapse Synapse

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

* Notify that SQLite min version will be bumped
* Mention in upgrade notes

Co-authored-by: reivilibre <oliverw@matrix.org>

Removes the ability to configure legacy direct TCP replication. Workers now require Redis to run.

Reverts commit fa71bb18, and tweaks documentation.

Signed-off-by: 3nprob <git@3n.anonaddy.com>

frozendict 2.3.3 includes fixes for memory leaks that get triggered during `/sync`.

* Drop support for delegating email validation

Delegating email validation to an IS is insecure (since it allows the owner of
the IS to do a password reset on your HS), and has long been deprecated. It
will now cause a config error at startup.

* Update unit test which checks for email verification

Give it an `email` config instead of a threepid delegate

* Remove unused method `requestEmailToken`

* Simplify config handling for email verification

Rather than an enum and a boolean, all we need here is a single bool, which
says whether we are or are not doing email verification.

* update docs

* changelog

* upgrade.md: fix typo

* update version number

this will be in 1.64, not 1.63

* update version number

this one too

Uniformize spam-checker API, part 4: port other spam-checker callbacks to return `Union[Allow, Codes]`. (#12857)

Co-authored-by: Brendan Abolivier <babolivier@matrix.org>

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

Signed-off-by: David Teller <davidt@element.io>

Add a unique index to `state_group_edges` to prevent duplicates being accidentally introduced and the consequential impact to performance. (#12687)

Add the `update_user_directory_from_worker` configuration option (superseding `update_user_directory`) to allow a generic worker to be designated as the worker to update the user directory. (#12654)

Co-authored-by: Shay <hillerys@element.io>

Add the `notify_appservices_from_worker` configuration option (superseding `notify_appservices`) to allow a generic worker to be designated as the worker to send traffic to Application Services. (#12452)

* Recommend poetry in docs

- readme
- contributor guide
- upgrade notes
- new dev cheat sheet for poetry

Co-authored-by: Shay <hillerys@element.io>
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>