Fix deprecated PreconditionViolationException

Author: joshka

src/test/java/net/joshka/junit/json/params/JsonFileArgumentsProviderTest.java

@@ -4,7 +4,7 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtensionContext;
 import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.platform.commons.util.PreconditionViolationException;
+import org.junit.platform.commons.PreconditionViolationException;
 
 import javax.json.JsonNumber;
 import javax.json.JsonObject;