action: don't install apt

.gitea/workflows/linux.yaml

@@ -7,14 +7,6 @@ jobs:
   Build:
     runs-on: ubuntu-latest
     steps:
-      - run: apt update
-
-      - name: Install deps
-        uses: awalsh128/cache-apt-pkgs-action@latest
-        with:
-          packages: libsdl2-dev libglew-dev
-          version: 1.0
-
       - name: Check out repository code
         uses: actions/checkout@v3