Order modifiers to align with JLS

This commit also applies Checkstyle ModifierOrder to enforce it.

See gh-31368

spring-test/src/main/java/org/springframework/test/web/reactive/server/WiretapConnector.java

@@ -126,7 +126,7 @@ class WiretapConnector implements ClientHttpConnector {
 	/**
 	 * Tap into a Publisher of data buffers to save the content.
 	 */
-	final static class WiretapRecorder {
+	static final class WiretapRecorder {
 
 		@Nullable
 		private final Flux<? extends DataBuffer> publisher;