update CI

Author: robb-j

.github/workflows/ci.yml

@@ -21,6 +21,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           cache: "npm"
+          node-version-file: .node-version
       - run: npm ci
       - run: npm run build
       - run: npm test

.github/workflows/pages.yml

@@ -28,6 +28,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           cache: "npm"
+          node-version-file: .node-version
 
       - run: npm ci