Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/lint.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Setup repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Setup Deno
         uses: denolib/setup-deno@v2
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Setup repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Setup Deno
         uses: denolib/setup-deno@v2

.github/workflows/ship.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Setup repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Setup Deno
         uses: denolib/setup-deno@v2