SDL_mixer: Updated to the latest version of SDL (a866f)

From a866fc7dcf4fe4f6bfcaf80afa9c00e2bbc17fb8 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 5 Jul 2024 12:20:54 -0700
Subject: [PATCH] Updated to the latest version of SDL

---
 external/SDL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/SDL b/external/SDL
index 99d28ca4..50ae47af 160000
--- a/external/SDL
+++ b/external/SDL
@@ -1 +1 @@
-Subproject commit 99d28ca485f76a5ad60a1f3497e1b6cf14932f59
+Subproject commit 50ae47af5e67099f9e99f96440c4159d3e87c88d