fix jackson imports (JabRef#14356)

Fixes JabRef#14355

Author: Siedlerchr

jablib/src/main/java/org/jabref/logic/importer/fetcher/UnpaywallFetcher.java

@@ -17,11 +17,11 @@
 import org.jabref.model.entry.field.StandardField;
 import org.jabref.model.search.query.BaseQueryNode;
 
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.ObjectMapper;
 import org.jspecify.annotations.NonNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import tools.jackson.databind.JsonNode;
+import tools.jackson.databind.ObjectMapper;
 
 /// Fetcher for <https://unpaywall.org/>
 ///