fix: cleanly exit on shutdown (#5537)

Co-authored-by: Mm2PL <mm2pl+gh@kotmisia.pl>
Co-authored-by: Nerixyz <nerixdev@outlook.de>

src/singletons/NativeMessaging.hpp

@@ -36,6 +36,7 @@ public:
     NativeMessagingServer(NativeMessagingServer &&) = delete;
     NativeMessagingServer &operator=(const NativeMessagingServer &) = delete;
     NativeMessagingServer &operator=(NativeMessagingServer &&) = delete;
+    ~NativeMessagingServer();
 
     void start();