Update cmake-sdl2.yml

Author: JunaMeinhold

.github/workflows/cmake-sdl2.yml

@@ -29,11 +29,6 @@ jobs:
         ref: 'release-2.30.8'
         path: 'SDL'
 
-    - name: Checkout specific commit
-      run: |
-        cd SDL
-        git checkout ba2f78a
-
     - name: Install dependencies on Ubuntu
       if: matrix.os == 'ubuntu-latest'
       run: |