fix: prefix a checkout action usage semver with 'v'

Signed-off-by: jmeridth <[email protected]>

Author: jmeridth

.github/workflows/jekyll-preview.yml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@4.2.2
+        uses: actions/checkout@v4.2.2
         with:
           # For PRs make sure to checkout the PR branch
           ref: ${{ github.event.pull_request.head.sha }}