fix: match setup-node node version with what's used by the little pi

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Check out yarn cache
         uses: actions/setup-node@v4
         with:
-          node-version: 14
+          node-version: 18
           cache: yarn
       - name: Install npm dependencies with yarn if needed
         run: yarn install --from-lock-file