fixup! fixup! Build SDL3 for ReadTheDocs workflow

Author: HexDecimal

.readthedocs.yaml

@@ -9,7 +9,7 @@ build:
   tools:
     python: "3.11"
   jobs:
-    post_build:
+    pre_install:
       - git clone --depth 1 --branch release-3.2.16 https://github.com/libsdl-org/SDL.git sdl_repo
       - cmake -S sdl_repo -B sdl_build
       - cmake --build sdl_build --config Debug