Revert SDL and SDL_MIXER upgrades

Updated SDL and SDL_MIXER versions in workflow.

Author: cclauss

.github/workflows/pythonapp.yml

@@ -4,8 +4,8 @@ on: [push, pull_request]
 
 env:
   FFMPEG_VERSION: "6.0"  # https://ffmpeg.org/releases/
-  SDL_VERSION: "2.32.10"  # https://github.com/libsdl-org/SDL/releases
-  SDL_MIXER_VERSION: "2.8.1"  # https://github.com/libsdl-org/SDL_mixer/releases
+  SDL_VERSION: "2.26.4"  # https://github.com/libsdl-org/SDL/releases
+  SDL_MIXER_VERSION: "2.6.3"  # https://github.com/libsdl-org/SDL_mixer/releasess
   USE_SDL2_MIXER: "1"
   MACOSX_DEPLOYMENT_TARGET: "10.13"
   MACOSX_DEPLOYMENT_TARGET_ARM: "11.0"