:art: Update RtMidi

diff --git a/plug b/plug
index 6b0bfb435c63aadc36559f849ac7a173094a7db6..4440cdf413e775b726d084c51b012ffe3e157ced 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit 6b0bfb435c63aadc36559f849ac7a173094a7db6
+Subproject commit 4440cdf413e775b726d084c51b012ffe3e157ced