Remove apt-get from CI (self-hosted has deps pre-installed)

Self-hosted runner already has QEMU, qemu-utils, dosfstools, and Python
installed. Remove the sudo apt-get step that was failing due to
password requirement.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: gaarutyunov

.github/workflows/test.yml

@@ -15,16 +15,6 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Install QEMU and dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y qemu-system-x86 qemu-utils dosfstools
-
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-
       - name: Download 9front image
         run: ./qemu/install-9front.sh