Update is_expiration_update json field name

https://gitlab.com/signald/signald/-/commit/d74486466067ad1ff64dd9968bc38f87d35c0dfc

mausignald/types.py

@@ -395,7 +395,7 @@ class MessageData(SerializableAttrs):
 
     end_session: bool = field(default=False, json="endSession")
     expires_in_seconds: int = field(default=0, json="expiresInSeconds")
-    is_expiration_update: bool = field(default=False, json="isExpirationUpdate")
+    is_expiration_update: bool = field(default=False)
     profile_key_update: bool = field(default=False, json="profileKeyUpdate")
     view_once: bool = field(default=False, json="viewOnce")