chore(deps): update actions/checkout action to v6 (#450)

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

Author: renovate[bot]

.github/workflows/continuous-delivery.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Use Node.js v20
         uses: actions/setup-node@v6
         with:

.github/workflows/continuous-integration.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Add problem matcher
         run: echo "::add-matcher::.github/problemMatchers/eslint.json"
       - name: Use Node.js v20
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Use Node.js v20
         uses: actions/setup-node@v6
         with:
@@ -46,7 +46,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Add problem matcher
         run: echo "::add-matcher::.github/problemMatchers/tsc.json"
       - name: Use Node.js v20

.github/workflows/labelsync.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           sparse-checkout: .github/labels.yml
           sparse-checkout-cone-mode: false