Update SDL2 to newest version to fix 7.1 playback

This fixes 7.1 playback. Before this commit, SDL used 7.1 front audio configuration with Center Left and Center Right speakers, but without Rear speakers.

See https://github.com/libsdl-org/SDL/issues/11709 for more details.

libs/SDL2/include/SDL_test_random.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -19,7 +19,7 @@
   3. This notice may not be removed or altered from any source distribution.
 */
 
-/**
+/*
  *  \file SDL_test_random.h
  *
  *  Include file for SDL test framework.
@@ -67,7 +67,7 @@ extern "C" {
 
 /* --- Function prototypes */
 
-/**
+/*
  *  \brief Initialize random number generator with two integers.
  *
  *  Note: The random sequence of numbers returned by ...Random() is the
@@ -81,7 +81,7 @@ extern "C" {
  void SDLTest_RandomInit(SDLTest_RandomContext * rndContext, unsigned int xi,
                   unsigned int ci);
 
-/**
+/*
  *  \brief Initialize random number generator based on current system time.
  *
  *  \param rndContext     pointer to context structure
@@ -90,7 +90,7 @@ extern "C" {
  void SDLTest_RandomInitTime(SDLTest_RandomContext *rndContext);
 
 
-/**
+/*
  *  \brief Initialize random number generator based on current system time.
  *
  *  Note: ...RandomInit() or ...RandomInitTime() must have been called