Merge pull request #2 from bwagner/fix-checkout-v4

FIXES: github checkout action to @v4 (avoids warning Node version)

.github/workflows/flat.yaml

@@ -14,7 +14,7 @@ jobs:
     steps: # This workflow has 3 steps
       # The first step is to check out the repository so it can read the files inside of it and do other operations
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       # This step installs Deno, which is a new Javascript runtime that improves on Node. We'll use it for postprocessing later
       - name: Setup deno
         uses: denoland/setup-deno@main