8231202: Suppress warnings on non-serializable non-transient instance fields in serializable classes

Reviewed-by: rriggs, chegar

src/java.base/share/classes/java/util/Arrays.java

@@ -4339,6 +4339,7 @@ public class Arrays {
     {
         @java.io.Serial
         private static final long serialVersionUID = -2764017481108945198L;
+        @SuppressWarnings("serial") // Conditionally serializable
         private final E[] a;
 
         ArrayList(E[] array) {