Endpoints framework depends on deprecated jackson function #204

Hi,
the endpoints framework makes use of the function getGenericType() of jackson. However this function was removed with jackson >= 2.11.0. Automatic dependency resolution with maven downloads the most current version of jackson though. This leads to the following error:

java.lang.NoSuchMethodError: com.fasterxml.jackson.databind.introspect.AnnotatedField.getGenericType()Ljava/lang/reflect/Type;

https://fasterxml.github.io/jackson-databind/javadoc/2.10/com/fasterxml/jackson/databind/introspect/AnnotatedField.html#getGenericType--