streamline some cache stuff?

Author: mydea

.github/workflows/build.yml

@@ -136,7 +136,6 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version-file: 'package.json'
-          cache: 'yarn'
 
         # we use a hash of yarn.lock as our cache key, because if it hasn't changed, our dependencies haven't changed,
         # so no need to reinstall them