pw_stream: Add missing override annotation

Change-Id: If0004779097bf515fb324b68e21549184a9fffec
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/100781
Reviewed-by: Ted Pudlik <tpudlik@google.com>
Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>

pw_stream/public/pw_stream/socket_stream.h

@@ -26,7 +26,7 @@ class SocketStream : public NonSeekableReaderWriter {
  public:
   constexpr SocketStream() = default;
 
-  ~SocketStream() { Close(); }
+  ~SocketStream() override { Close(); }
 
   // Listen to the port and return after a client is connected
   Status Serve(uint16_t port);