fix CI

Author: schickling

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
   build-example-next-contentlayer-example:
     strategy:
       matrix:
-        node-version: [14, 16, 17, 18]
+        node-version: [17, 18] # `app` dir requires 17+
         os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps: