Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -31,7 +31,7 @@ jobs:
       DEPLOY_TARGET: ${{ github.event_name == 'push' && 'production' || github.event_name == 'workflow_dispatch' && github.event.inputs.target || 'preview' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
@@ -64,7 +64,7 @@ jobs:
       TELEGRAPH_ACCESS_TOKEN: ${{ secrets.TELEGRAPH_ACCESS_TOKEN }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
@@ -110,7 +110,7 @@ jobs:
       TELEGRAPH_ACCESS_TOKEN: ${{ secrets.TELEGRAPH_ACCESS_TOKEN }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0