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

Author: renovate[bot]

.github/workflows/badges.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout 🛎
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Update version badges 🏷
         run: npx -p dependency-version-badge update-badge json-server cypress

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout 🛎
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Run tests 🧪
         # https://github.com/cypress-io/github-action