Allow configuring synapse `auto_join_mxid_localpart`

chore(deps): update dependency docker to v7.3.0

`auto_join_mxid_localpart` defines the local part of the user id which is used to create auto-join rooms. The variable needs to be set to invite new users to any auto-join rooms which are set to invite-only.

chore(deps): update matrixdotorg/sygnal docker tag to v0.15.0

Fix typo in Sliding Sync Proxy docs

chore(deps): update dependency grafana to v11.1.0-0

Related to 4704a60718

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1681

By appending `/webhook` to the public URL (becoming `/hookshot/webhooks/webhook`)
and by only stripping the `/hookshot/webhooks` prefix,
we're effectively following what newer Hookshot versions advise
(see https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1681).

This change appears to be backward-compatible (old webhook URLs like `/hookshot/webhooks/:hookId` still work),
until Hookshot behavior changes.

Regression since 78912688734589d67a9213201dbae45d231fad84,
where I removed the `matrix_hookshot_urlprefix` prefix group
`group_vars/matrix_servers`, thinking the value in `roles/custom/matrix-bridge-hookshot/defaults/main.yml`
was the same.

The value in `defaults/main.yml` incorrectly included `matrix_hookshot_public_endpoint`
in `matrix_hookshot_urlprefix`, which was leading to double-`/hookshot`-prefixing.

We were previously saved by the `matrix_hookshot_urlprefix` override in `group_vars/matrix_servers`.

This fix brings the correct URL prefix value (the one without `matrix_hookshot_public_endpoint`)
to `defaults/main.yml`.

Make maubot automatically create its own user.

chore(deps): update halfshot/matrix-hookshot docker tag to v5.4.1

chore(deps): update halfshot/matrix-hookshot docker tag to v5.4.0

chore(deps): update dependency prometheus to v2.53.0-0

chore(deps): update joseluisq/static-web-server docker tag to v2.32.0

chore(deps): update vectorim/element-web docker tag to v1.11.69

Related to https://github.com/element-hq/synapse/pull/17147

chore(deps): update dock.mau.dev/mautrix/whatsapp docker tag to v0.10.8

chore(deps): update dock.mau.dev/mautrix/signal docker tag to v0.6.2

chore(deps): update dock.mau.dev/mautrix/gmessages docker tag to v0.4.2

sliding sync metrics support

chore(deps): update matrixconduit/matrix-conduit docker tag to v0.8.0

Fix docs typo

fix(synapse/goofys): resolve Jinja2 syntax error in systemd service template

Commit 4224741130 missed a endfor
statement in the goofys systemd service unit template. This adds it,
avoiding a Jinja2 syntax error when using goofys.

Fixup for f97e849018

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3354