This reverts commit c8c6a83ecc.

Synapse v1.142.0 is broken for Matrix Authentication Service deployments
that use a path-prefix (e.g. `/auth`) such as ours.

For such deployments, Synapse fails to contact MAS at the correct
introspection endpoint (it keeps hitting `/oauth2/introspect`, instead of `/auth/oauth2/introspect`)
and is not usable.

Related to 3595ff921f

Ref:
- https://github.com/element-hq/synapse/releases/tag/v1.141.0
- https://github.com/element-hq/synapse/pull/19064

> The Docker images are now based on Debian trixie and use Python 3.13.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4637

We no longer need to boto workaround since s3-storage-provider got
upgraded to v1.6.0 in https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4635

* synapse - introduce matrix_synapse_url_preview_url_blacklist var

* Preserve original comments around `url_preview_url_blacklist`

---------

Co-authored-by: Aleksandrs Jansons <alex@peledu.casa>
Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Ref: https://github.com/matrix-org/synapse-s3-storage-provider/pull/134#issuecomment-3396609289

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4635

This reverts commit 2b0ea94a72.

We're going back to s3-storage-provider=v1.5.0

Ref: https://github.com/matrix-org/synapse-s3-storage-provider/pull/134#issuecomment-3396609289

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4637

We no longer need to boto workaround since s3-storage-provider got
upgraded to v1.6.0 in https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4635

`depName` is a required attribute as per our custom regex.

Ref:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4635
- 2d05db52c7/.github/renovate.json (L16)

Related to https://github.com/element-hq/synapse/pull/18759

Currently problematic (leading to failures to start for Synapse) because of:
https://github.com/element-hq/synapse/pull/18759#issuecomment-3172744530

This defaults to true for end user comfort as it helps assure them the modules connection to the consumer is working or is definitively not working. (As far as i have been told it retries until success)

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Supersedes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4284

This works around an issue with Matrix Authentication Service's `syn2mas` sub-command (at version v0.16.0),
which chokes with an error:

> Error: Failed to load Synapse configuration
> Caused by:
> invalid type: found unit, expected struct EnableableSection for key "default.cas_config" in homeserver.yaml YAML file

This issue is likely to be fixed in MAS v0.16.1 or v0.17.0.

This also reverts e5574a405e because:
- it was causing issues on some servers (not clear why)
- such workarounds are no longer necessary when doing multi-stage building.

This is a security patch for Synapse that fixes an actively exploited bug.