Bump actions/checkout from 3 to 4 (#46)

Author: dependabot[bot]

.github/workflows/deno.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Setup repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Deno
         uses: denoland/setup-deno@v2