Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         ruby-version: ['3.2', '3.3', '3.4', '4.0']
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}

.github/workflows/integration.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         ruby-version: ['3.2', '3.3', '3.4', '4.0']
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}

bin/template/.github/workflows/deploy-gh-pages.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v2.7.0
+        uses: actions/checkout@v6.0.2
         with:
           persist-credentials: false