Add dependency for ZoneId

Author: samsnyk

core/src/main/java/io/snyk/plugins/artifactory/scanner/ScannerModule.java

@@ -21,6 +21,7 @@
 import javax.annotation.Nonnull;
 import java.time.Duration;
 import java.time.Instant;
+import java.time.ZoneId;
 import java.util.LocalDate;
 import java.util.Optional;