chore: update to actions/checkout@v7 in actions (#10)

Author: szuend

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Setup repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Setup Deno
         uses: denoland/setup-deno@v2

.github/workflows/publish.yml

@@ -18,7 +18,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Setup Deno
         uses: denoland/setup-deno@v2