Suppress serialization warnings

This commit suppresses serialization warnings triggered by the upgrade
of javac from 17 to 23.

See gh-34220

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

@@ -101,6 +101,7 @@ public class MimeType implements Comparable<MimeType>, Serializable {
 
 	private final String subtype;
 
+	@SuppressWarnings("serial")
 	private final Map<String, String> parameters;
 
 	private transient @Nullable Charset resolvedCharset;

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

@@ -47,6 +47,7 @@ final class UnmodifiableMultiValueMap<K,V> implements MultiValueMap<K,V>, Serial
 
 	private static final long serialVersionUID = -8697084563854098920L;
 
+	@SuppressWarnings("serial")
 	private final MultiValueMap<K, V> delegate;
 
 	private transient @Nullable Set<K> keySet;
@@ -264,6 +265,7 @@ final class UnmodifiableMultiValueMap<K,V> implements MultiValueMap<K,V>, Serial
 
 		private static final long serialVersionUID = 2407578793783925203L;
 
+		@SuppressWarnings("serial")
 		private final Set<Entry<K, List<V>>> delegate;
 
 		@SuppressWarnings("unchecked")
@@ -512,6 +514,7 @@ final class UnmodifiableMultiValueMap<K,V> implements MultiValueMap<K,V>, Serial
 
 		private static final long serialVersionUID = 5518377583904339588L;
 
+		@SuppressWarnings("serial")
 		private final Collection<List<V>> delegate;
 
 		public UnmodifiableValueCollection(Collection<List<V>> delegate) {