remove conflicting dependencies of Jackson

[alethander]

Fix

Exception in thread "main" java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonGenerator.writeStartArray(Ljava/lang/Object;I)V
        at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:78)
        at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18)
        at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727)
        at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:722)

Spring Boot already has jackson-databind:2.10.0 as a transitive dependency.
Apparently, there is some version clash when two versions are on the classpath.

[slinlee]

👍🏽