Upgrade Synapse (1.51.0 -> 1.52.0)

This also removes the `matrix_synapse_version_arm64` variable we've
been dragging around for a long time.

Since https://github.com/matrix-org/synapse/pull/11810, a multiarch Synapse
container image (for AMD64 and ARM64) is released at the same time.

roles/matrix-synapse/defaults/main.yml

@@ -8,16 +8,8 @@ matrix_synapse_container_image_self_build_repo: "https://github.com/matrix-org/s
 
 matrix_synapse_docker_image: "{{ matrix_synapse_docker_image_name_prefix }}matrixdotorg/synapse:{{ matrix_synapse_docker_image_tag }}"
 matrix_synapse_docker_image_name_prefix: "{{ 'localhost/' if matrix_synapse_container_image_self_build else matrix_container_global_registry_prefix }}"
-# The if statement below may look silly at times (leading to the same version being returned),
-# but ARM-compatible container images are only released 1-7 hours after a release,
-# so we may often be on different versions for different architectures when new Synapse releases come out.
-#
-# amd64 gets released first.
-# arm32 relies on self-building, so the same version can be built immediately.
-# arm64 users need to wait for a prebuilt image to become available.
-matrix_synapse_version: v1.51.0
-matrix_synapse_version_arm64: v1.51.0
-matrix_synapse_docker_image_tag: "{{ matrix_synapse_version if matrix_architecture in ['arm32', 'amd64'] else matrix_synapse_version_arm64 }}"
+matrix_synapse_version: v1.52.0
+matrix_synapse_docker_image_tag: "{{ matrix_synapse_version }}"
 matrix_synapse_docker_image_force_pull: "{{ matrix_synapse_docker_image.endswith(':latest') }}"
 
 matrix_synapse_base_path: "{{ matrix_base_data_path }}/synapse"

roles/matrix-synapse/tasks/validate_config.yml

@@ -48,6 +48,7 @@
     - {'old': 'matrix_synapse_cache_factor', 'new': 'matrix_synapse_caches_global_factor'}
     - {'old': 'matrix_synapse_trusted_third_party_id_servers', 'new': '<deprecated in Synapse v0.99.4 and removed in Synapse v1.19.0>'}
     - {'old': 'matrix_synapse_use_presence', 'new': 'matrix_synapse_presence_enabled'}
+    - {'old': 'matrix_synapse_version_arm64', 'new': '<superseded by matrix_synapse_version - see https://github.com/matrix-org/synapse/pull/11810>'}
 
 - name: (Deprecation) Catch and report renamed settings in matrix_synapse_configuration_extension_yaml
   fail:

roles/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -488,6 +488,20 @@ limit_remote_rooms:
 #
 #allow_per_room_profiles: false
 
+# The largest allowed file size for a user avatar. Defaults to no restriction.
+#
+# Note that user avatar changes will not work if this is set without
+# using Synapse's media repository.
+#
+#max_avatar_size: 10M
+
+# The MIME types allowed for user avatars. Defaults to no restriction.
+#
+# Note that user avatar changes will not work if this is set without
+# using Synapse's media repository.
+#
+#allowed_avatar_mimetypes: ["image/png", "image/jpeg", "image/gif"]
+
 # How long to keep redacted events in unredacted form in the database. After
 # this period redacted events get replaced with their redacted form in the DB.
 #
@@ -1458,6 +1472,16 @@ autocreate_auto_join_rooms: {{ matrix_synapse_autocreate_auto_join_rooms|to_json
 #
 #auto_join_rooms_for_guests: false
 
+# Whether to inhibit errors raised when registering a new account if the user ID
+# already exists. If turned on, that requests to /register/available will always
+# show a user ID as available, and Synapse won't raise an error when starting
+# a registration with a user ID that already exists. However, Synapse will still
+# raise an error if the registration completes and the username conflicts.
+#
+# Defaults to false.
+#
+#inhibit_user_in_use_error: true
+
 
 ## Metrics ###