(CI) revert custom python and cmake install

Author: MatthijsBurgh

.github/workflows/ci.yml

@@ -36,16 +36,6 @@ jobs:
         with:
           path: ros_ws/src
 
-      - name: Install CMake
-        uses: ssrobins/install-cmake@v1
-        with:
-          version: 3.28.3
-
-      - name: Setup Python
-        uses: actions/setup-python@v6
-        with:
-          python-version: '3.12'
-
       - uses: ros-tooling/setup-ros@v0.7
 
       - uses: ros-tooling/action-ros-ci@v0.4