chore(deps) Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/lighthouse.yml

@@ -8,7 +8,7 @@ jobs:
       cancel-in-progress: true
     steps:
     - name: 💾 Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: ${{ github.event.pull_request.head.sha }}
 

.github/workflows/linkcheck.yml

@@ -8,7 +8,7 @@ jobs:
       cancel-in-progress: true
     steps:
     - name: 💾 Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: ⎔ Setup node
       uses: actions/setup-node@v5

.github/workflows/update.yaml

@@ -12,7 +12,7 @@ jobs:
     if: github.ref_name == 'dev'
     steps:
     - name: 💾 Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: master