Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: ⚙️ Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Markdownlint CLi Action
         uses: DavidAnson/markdownlint-cli2-action@v20

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: ⚙️ Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0