Upgrade ansible-role-backup_borg (v1.4.4-2.1.6-1 -> v1.4.4-2.1.6-2) and wire via _auto variables

The new role version splits backup_borg_location_exclude_patterns into
auto/custom components, following the existing split for
backup_borg_location_source_directories. The playbook now wires its
computed values into the _auto variables for both, so users can append
their own entries via the _custom variables instead of redefining the
whole lists and accidentally dropping playbook-provided values.
Previously, redefining backup_borg_location_exclude_patterns dropped
the postgres_data_path exclusion (making borg walk live Postgres data
and fail with warning exit codes), and the playbook's own
source_directories wiring made the role's _custom variable a no-op.

Related to #5092

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

group_vars/matrix_servers

@@ -3399,12 +3399,12 @@ backup_borg_postgresql_databases_password: "{{ postgres_connection_password if p
 backup_borg_postgresql_databases_port: "{{ postgres_connection_port if postgres_enabled else 5432 }}"
 backup_borg_postgresql_databases_auto: "{{ postgres_managed_databases | map(attribute='name') if postgres_enabled else [] }}"
 
-backup_borg_location_source_directories:
+backup_borg_location_source_directories_auto:
   - "{{ matrix_base_data_path }}"
 
 # local_thumbnails is deliberately NOT excluded: with dynamic_thumbnails disabled (Synapse's default),
 # nothing regenerates lost thumbnails, so the official Synapse backup guide recommends backing them up.
-backup_borg_location_exclude_patterns: |
+backup_borg_location_exclude_patterns_auto: |
   {{
     ([matrix_synapse_media_store_path + '/remote_content', matrix_synapse_media_store_path + '/remote_thumbnail', matrix_synapse_media_store_path + '/url_cache', matrix_synapse_media_store_path + '/url_cache_thumbnails'] if matrix_homeserver_implementation == 'synapse' else [])
     +

requirements.yml

@@ -4,7 +4,7 @@
   version: v1.0.0-7
   name: auxiliary
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-backup_borg.git
-  version: v1.4.4-2.1.6-1
+  version: v1.4.4-2.1.6-2
   name: backup_borg
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-cinny.git
   version: v4.12.3-0