remove incompatible jackson config

backend/src/main/resources/application.yml

@@ -38,12 +38,6 @@ spring:
         format_sql: true
     open-in-view: false
 
-  jackson:
-    serialization:
-      write-dates-as-timestamps: false
-    deserialization:
-      fail-on-unknown-properties: false
-
   flyway:
     enabled: ${FLYWAY_ENABLED:false}