Release 5.12.3

### Changelog:
- Feature(backend): Add deduplication for Centrifugo messages.
- Fix(backend): Correct migration status check.
- Fix(backend): Restore config-based toggle for registration endpoint.
- Chore(backend,frontend): Update dependencies (Django, Pillow, Coverage, Yarn packages, etc.).
- Chore(docs): Remove ``verify`` config setting references.

doc/config.rst

@@ -612,14 +612,18 @@ every 5 seconds (by default).
 * **api_key** - API key for clients.
 * **token_hmac_secret_key** - API key for jwt-token generation.
 * **timeout** - Connection timeout.
-* **verify** - Connection verification.
 * **subscriptions_prefix** - Prefix used for generating update channels, by default "{VST_PROJECT}.update".
 
 .. note::
     These settings also add parameters to the OpenAPI schema and change how the auto-update system works in the GUI.
     ``token_hmac_secret_key`` is used for jwt-token generation (based on
     session expiration time). Token will be used for Centrifugo-JS client.
 
+.. warning::
+    Please note that ``verify`` is no longer used. If you need to use self-signed certificates,
+    you must add them to the system's trusted list.
+    Otherwise, it makes more sense to communicate with the Centrifugo API over plain-HTTP and use a terminating proxy for clients.
+
 
 .. _storages: