Suppress serial warning for JDK21 (#2935)

* Suppress serial warning for JDK21

In JDK21, it now throws the serial warning for including potentially
unserializable instance variables. This includes the standard Java data
structures like List, Set, and Map. This changes the JDK21 support from
#2903 to suppress the warning rather
than no longer serializing the variables.

* Keep CategoryMask as transient

api/src/main/java/ai/djl/translate/PaddingStackBatchifier.java

@@ -29,10 +29,17 @@ public final class PaddingStackBatchifier implements Batchifier {
 
     private static final long serialVersionUID = 1L;
 
-    private transient List<Integer> arraysToPad;
-    private transient List<Integer> dimsToPad;
+    @SuppressWarnings("serial")
+    private List<Integer> arraysToPad;
+
+    @SuppressWarnings("serial")
+    private List<Integer> dimsToPad;
+
     private transient List<NDArraySupplier> paddingSuppliers;
-    private transient List<Integer> paddingSizes;
+
+    @SuppressWarnings("serial")
+    private List<Integer> paddingSizes;
+
     private boolean includeValidLengths;
 
     private PaddingStackBatchifier(Builder builder) {