SDL_mixer: Updated to the latest version of SDL (12483)

From 124831c87e6e546ee905db38e1c2f6086fc3c18c Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Sat, 7 Sep 2024 01:33:10 +0300
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 85bbc602..e21f70c5 160000
--- a/external/SDL
+++ b/external/SDL
@@ -1 +1 @@
-Subproject commit 85bbc6028ad36e2c1daa8fac60ae07562077b17e
+Subproject commit e21f70c5936c98e7abf762931ac2518d0a4e3753