Add serialVersionUID in LinkedCaseInsensitiveMap

Closes gh-35535

Signed-off-by: Yanming Zhou <zhouyanming@gmail.com>

spring-core/src/main/java/org/springframework/util/LinkedCaseInsensitiveMap.java

@@ -47,9 +47,10 @@ import org.jspecify.annotations.Nullable;
  * @since 3.0
  * @param <V> the value type
  */
-@SuppressWarnings("serial")
 public class LinkedCaseInsensitiveMap<V> implements Map<String, V>, Serializable, Cloneable {
 
+	private static final long serialVersionUID = -1797561627545787622L;
+
 	private final LinkedHashMap<String, V> targetMap;
 
 	private final HashMap<String, String> caseInsensitiveKeys;