Bump actions/checkout from 5 to 6 (#2937)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/bundle-audit.yml

@@ -11,7 +11,7 @@ jobs:
   audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: 'Bundler Audit'
         uses: thoughtbot/bundler-audit-action@main
         env:

.github/workflows/codeql-analysis.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v4

.github/workflows/diff-check.yml

@@ -8,7 +8,7 @@ jobs:
     env:
       DIFF_CHECK_APPRAISAL: "true"
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
       - run: bundle install
       - uses: nickcharlton/diff-check@main
@@ -18,7 +18,7 @@ jobs:
   builds:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JS
         uses: actions/setup-node@v6
         with:

.github/workflows/lint.yml

@@ -14,7 +14,7 @@ jobs:
       contents: read
       checks: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: StandardRB Linter
         uses: testdouble/standard-ruby-action@main
         env:
@@ -23,7 +23,7 @@ jobs:
   stylelint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JS
         uses: actions/setup-node@v6
         with:

.github/workflows/main.yml

@@ -33,7 +33,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Ruby ${{ matrix.ruby }}
         uses: ruby/setup-ruby@v1
         with:
@@ -91,7 +91,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup the environment
         run: cp .sample.env .env
       - run: cp spec/example_app/config/database.yml.sample spec/example_app/config/database.yml