Upgrade everit-json-schema dependency to version 1.14.6. (#426)

Author: blackwinter

build.gradle

@@ -35,7 +35,7 @@ subprojects {
       'dbcp':             '1.4',
       'dspace':           '1.0.0',
       'equalsverifier':   '3.8.2',
-      'everit':           '1.14.2',
+      'everit':           '1.14.6',
       'guava':            '32.0.1-jre',
       'jackson':          '2.15.1',
       'jdk':              '11',