Jackson 2.14.0 introduces NPE

[mattnelson]

Have been using dependency management to use this library with more recent versions of jackson. Starting with 2.14.0 a NPE is introduced when using patch to add a new element that was previously null.

java.lang.NullPointerException: Cannot invoke "String.equals(Object)" because the return value of "com.fasterxml.jackson.core.JsonPointer.getMatchingProperty()" is null
	at io.progix.dropwizard.patch.JsonPath.<init>(JsonPath.java:70)
	at io.progix.dropwizard.patch.ContextualJsonPatch.apply(ContextualJsonPatch.java:106)

Based on the class docs of JsonPointer the rewrite is the likely culprit.
https://github.com/FasterXML/jackson-core/blob/2.14/src/main/java/com/fasterxml/jackson/core/JsonPointer.java#L16

Note that the implementation was largely rewritten for Jackson 2.14 to
reduce memory usage by sharing backing "full path" representation for
nested instances.