Add empty finalizers to non-final classes that throw exceptions

A new Spotbugs error indicated that nefarious subclasses may leave the
superclass in a half-initialized state through a "finalizer attack".

While no exploit is known, fixing this is the right thing to do.

Moreover, empty finalizers may even be a performance optimization; see
https://stuartmarks.wordpress.com/2022/04/27/why-write-an-empty-finalize-method/

kohlschutter-test-util/src/main/java/com/kohlschutter/testutil/OutputBridge.java

@@ -91,6 +91,12 @@ private OutputBridge(Process process, ProcessStream output, byte[] prefix) {
     }
   }
 
+  @SuppressWarnings({"NoFinalizer" /* checkstyle */, "PMD.EmptyFinalizer"})
+  @Deprecated
+  @Override
+  protected final void finalize() {
+  }
+
   @Override
   public final void run() {
     bos = new ByteArrayOutputStream();