Use prebuilt ARM images for coturn / synapse-admin

* synapse-admin arm64 builds available since 2021-12-17 v.0.8.4 [awesometechnologies/synapse-admin:0.8.5](https://hub.docker.com/layers/synapse-admin/awesometechnologies/synapse-admin/0.8.5/images/sha256-eb54b8660c4641641b8acd08fd2dfc94ecc3fc604860f9e8b286a38008e3f3b6?context=explore)

* coturn arm32/arm64 builds available since 2021-04-15 v.4.5.2-r0-alpine [coturn/coturn:4.5.2-r12](https://hub.docker.com/layers/coturn/coturn/coturn/4.5.2-r12/images/sha256-94887581bb1093085033be0494c3a651bd40034afba1867ddc78b8ba32dc2faf?context=explore)

Update Buscarron 1.1.0 -> 1.2.0

Synapse workers should respect X-Forwarded headers

Currently, Synapse workers ignore the X-Forwarded headers, which leads to internal Docker IP addresses randomly appearing in the users' device list.

This adds the `x_forwarded: true` option to the worker config, fixing the issue.

Fixup for 5eff67371d - https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1884

add synapse media_retention

Update mautrix-whatsapp 0.4.0 -> 0.5.0

matrix-corporal 2.3.0 supports Synapse v1.61.0 (which removed
communities/groups support).

Update Element v1.10.14 -> v1.10.15

Doc fixups for go-skype-bridge

Fixup for #1877.

Add Go Skype Bridge

Based on mautrix-whatsapp, as that's what the bridge software is based on.

Whatsapp bridge: Logging improvements

Debug logs are inappropriate for production use.

Fixes #1873

The same logs still go to the systemd journal.

update PIP install-link

Continuation of 959a6ac0b1

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1772

Updated mautrix-googlechat to v0.3.3

Fix string "null" in status_endpoint

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1864

Related to https://github.com/zeratax/matrix-registration/issues/93

This is a poor way to do things though. It may break again in the future.
matrix-registration is a poorly maintained project and should likely be removed from the playbook.

update Honoroit 0.9.8 -> 0.9.9

Now that https://github.com/digitalentity/matrix_encryption_disabler/pull/9
has been merged, we can get the module from there.

Continuation of 246c43be1e

Source: https://github.com/matrix-org/synapse/blob/v1.59.0/docs/upgrade.md#deprecation-of-the-synapseappappservice-and-synapseappuser_dir-worker-application-types

As an alternative, we should probably find a way to run one or a few
more generic workers (which will handle appservice and user_dir stuff) and
update `homeserver.yaml` so that it would point to the name of these workers using
`notify_appservices_from_worker` and `update_user_directory_from_worker` options.

For now, this solves the deprecation, so we can have a peace of mind
going forward.

We're force-setting these worker counts to 0, so that we can clean up
existing homeservers which use these worker types. In the future, these
options will either be removed or repurposed (so that they transparently
create more generic workers that handle user_dir/appservice loads).

Update Honoroit 0.9.7 -> 0.9.8

* add `NOENCRYPTION` option
* fix race condition on thread start
* fix greetings messages
* updated deps

Update Cinny 2.0.3 -> 2.0.4

Fix dead-links in configuring-playbook-bridge-hookshot.md