Fix CI workflow

Author: ThatHackerDudeFromCyberspace

.github/workflows/main.yml

@@ -23,6 +23,7 @@ jobs:
     - name: Compile KindleTool
       if: steps.cache-kindletool.outputs.cache-hit != 'true'
       run: |
+          sudo apt-get update
           sudo apt-get install -y zlib1g-dev libarchive-dev nettle-dev
           make
     - uses: actions/upload-artifact@v4