Restore API/ABI compatibility with version 0.42.37

servicetalk-http-netty/src/main/java/io/servicetalk/http/netty/ProxyResponseException.java

@@ -41,4 +41,9 @@ public class ProxyResponseException extends ProxyConnectResponseException implem
     public HttpResponseStatus status() {
         return response().status();
     }
+
+    @Override
+    public String toString() {
+        return super.toString();
+    }
 }

servicetalk-transport-api/src/main/java/io/servicetalk/transport/api/ConnectionObserver.java

@@ -56,7 +56,7 @@ public interface ConnectionObserver {
      * @deprecated Use {@link #onTransportHandshakeComplete(ConnectionInfo)}
      */
     @Deprecated
-    default void onTransportHandshakeComplete() {
+    default void onTransportHandshakeComplete() {   // FIXME: 0.43 - remove deprecated method
     }
 
     /**

servicetalk-transport-netty-internal/src/main/java/io/servicetalk/transport/netty/internal/NoopTransportObserver.java

@@ -68,6 +68,11 @@ public void onDataWrite(final int size) {
         public void onFlush() {
         }
 
+        @Override
+        @SuppressWarnings("deprecation")
+        public void onTransportHandshakeComplete() {
+        }
+
         @Override
         public void onTransportHandshakeComplete(final ConnectionInfo info) {
         }