Remove accidental org.jetbrains:annotations usage.

See spring-projects/spring-data-build#2670

Author: mp911de

src/main/java/org/springframework/data/couchbase/querydsl/document/AbstractCouchbaseQueryDSL.java

@@ -21,7 +21,8 @@
 import java.util.List;
 import java.util.Map;
 
-import org.jetbrains.annotations.Nullable;
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.data.couchbase.core.mapping.CouchbaseDocument;
 import org.springframework.data.couchbase.core.query.QueryCriteriaDefinition;