[externals] Update SDL2 (#3731)

https://github.com/libsdl-org/SDL/pull/15207

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3731

externals/cpmfile.json

@@ -140,7 +140,7 @@
         "package": "SDL2",
         "name": "SDL2",
         "repo": "crueter-ci/SDL2",
-        "version": "2.32.10-cf5dabd6ea",
+        "version": "2.32.10-3c28e8ecc0",
         "min_version": "2.26.4"
     },
     "catch2": {