chore: upgrade actions/checkout to v5 in CI and release workflows (#27)

Author: katayama8000

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: 📥 Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
 
       - name: 🟢 Setup Node.js
         uses: actions/setup-node@v4

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0