* synapse - introduce matrix_synapse_url_preview_url_blacklist var

* Preserve original comments around `url_preview_url_blacklist`

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

chore(deps): update gnuxie/draupnir docker tag to v2.7.1

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)

chore(deps): update halfshot/matrix-hookshot docker tag to v7.2.0

chore(deps): update hif1/heisenbridge docker tag to v1.15.4

Regression since db54063a0c

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4617

Builds up on top of d0adc8a374

Ref:
- d00258c03d
- 1a60318553