Update actions/checkout action to v6 (#43)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/deploy-dev.yml

@@ -17,15 +17,15 @@ jobs:
     container: ghcr.io/cn-writing/cspell
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: CSpell English
         run: task spell-check
   build:
     runs-on: ubuntu-latest
     container: ghcr.io/cn-writing/hugo
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Build with Hugo

.github/workflows/deploy-prod.yml

@@ -21,15 +21,15 @@ jobs:
     container: ghcr.io/cn-writing/cspell
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: CSpell English
         run: task spell-check
   build:
     runs-on: ubuntu-latest
     container: ghcr.io/cn-writing/hugo
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Build with Hugo
@@ -46,7 +46,7 @@ jobs:
     needs: build
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Download the built site
@@ -72,7 +72,7 @@ jobs:
     needs: publish
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Download the built site

.github/workflows/pull-request.yml

@@ -11,7 +11,7 @@ jobs:
     container: ghcr.io/cn-writing/cspell
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: CSpell
         run: task spell-check
   build:
@@ -21,7 +21,7 @@ jobs:
       ENV: development
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Build with Hugo