Silence remaining Queuez banner warning

Sunrise/src/server/bap/encrypted/push/queuez/queuez_banner_push.cpp

@@ -56,7 +56,7 @@ void report_fail(const char* stage, const char* reason) noexcept {
 [[nodiscard]] bool append_appearance_frame(Scratch& scratch,
                                            const queuez::CharacterAppearanceRefresh& refresh,
                                            snapshot::Prepared& prepared,
-                                           const char* stage,
+                                           [[maybe_unused]] const char* stage,
                                            std::span<const std::byte, state::kAesKeySize> key,
                                            std::array<std::byte, state::kBapNonceSize>& nonce,
                                            std::span<std::byte> response,