Update node version (#41)

Author: pcarapic15

.github/workflows/build_publish.yml

@@ -15,6 +15,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 20
       - uses: enriikke/gatsby-gh-pages-action@v2
         with:
           access-token: ${{ secrets.HOME_TOKEN }}