:art: Update RtMidi

diff --git a/plug b/plug
index 532e013acd08176602b4d292225dfe69b297c49b..6b0bfb435c63aadc36559f849ac7a173094a7db6 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit 532e013acd08176602b4d292225dfe69b297c49b
+Subproject commit 6b0bfb435c63aadc36559f849ac7a173094a7db6