Update build.yml

Author: basarat

.github/workflows/build.yml

@@ -18,7 +18,6 @@ jobs:
       - run: sudo apt update
       - run: sudo apt install calibre-bin
       - run: sudo npm install -g gitbook-cli
-      - run: npm cache clean --force # https://github.com/nodejs/help/issues/2874
       - run: gitbook install
       - run: mkdir output
       - run: gitbook pdf . ./output/typescript-book-${SHA}.pdf