as per documentation: "Services that need no further configuration are enabled by default" and feeds service doesn't require it

This reverts commit 65bfc1396e.

The 1.8.1 image is published now, so we can finally upgrade.

This reverts commit 05ccee9f6f.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1952

No docker tag published yet, [keep an eye on it](https://hub.docker.com/r/halfshot/matrix-hookshot/tags?page=1&ordering=last_updated&name=1.8.1)

Reference: https://ansible-lint.readthedocs.io/en/latest/default_rules/#var-naming

We don't really fix these, but just suppress them,
because they're like that intentionally.

We try to name variables in a way that is consistent with the
configuration key they control. If the upstream component uses
camelCase, we also need to include camelCase in the variable name.

This new version should be buildable on arm64.

See: https://github.com/matrix-org/matrix-hookshot/releases/tag/1.7.0

There's still no prebuild arm64 image, so we continue relying on
self-building there.

https://github.com/matrix-org/matrix-hookshot/releases/tag/1.4.0

all features were actually already silently supported 🎉

upstream changelog: https://github.com/matrix-org/matrix-hookshot/releases/tag/1.2.0

see Half-Shot/matrix-hookshot#167