chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@v6.0.2
       - uses: ./.github/actions/prepare
       - name: Use pnpm to build site
         run: |

.github/workflows/deploy.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@v6.0.2
       - uses: ./.github/actions/prepare
       - name: Use pnpm to build site
         run: pnpm build