Update to mautrix-python 0.8.0.beta3

* Cross-server double puppeting is now possible
* End-to-bridge encryption no longer requires login_shared_secret,
  but the homeserver must support MSC2778 (Synapse 1.21+)

mautrix_telegram/config.py

@@ -105,7 +105,14 @@ class Config(BaseBridgeConfig):
         copy("bridge.public_portals")
         copy("bridge.sync_with_custom_puppets")
         copy("bridge.sync_direct_chat_list")
-        copy("bridge.login_shared_secret")
+        copy("bridge.double_puppet_server_map")
+        copy("bridge.double_puppet_allow_discovery")
+        if "bridge.login_shared_secret" in self:
+            base["bridge.login_shared_secret_map"] = {
+                base["homeserver.domain"]: self["bridge.login_shared_secret"]
+            }
+        else:
+            copy("bridge.login_shared_secret_map")
         copy("bridge.telegram_link_preview")
         copy("bridge.inline_images")
         copy("bridge.image_as_file_size")