Use actions/checkout@v3

hopefully fixes workflow bug that appeared in just the last week

Author: duvallj

.github/workflows/main.yml

@@ -7,9 +7,9 @@ jobs:
     if: github.ref == 'refs/heads/main'
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: build_and_deploy
-        uses: shalzz/zola-deploy-action@v0.14.1
+        uses: shalzz/zola-deploy-action@v0.16.1-1
         env:
           # Target branch
           PAGES_BRANCH: gh-pages