Productized Json schema validator artefact does not have valid pom.xml header

The pom.xml schema location points to https://maven.apache.org/POM/4.0.0 which is not valid, as only http://maven.apache.org/POM/4.0.0 is valid.

The offending pom: https://github.com/networknt/json-schema-validator/blob/master/pom.xml#L18-L20