build(deps): Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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>

Author: dependabot[bot]

.github/workflows/bc-check.yml

@@ -7,7 +7,7 @@ jobs:
   bc-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Detect minimum PHP from composer.json

.github/workflows/changelog.yml

@@ -7,7 +7,7 @@ jobs:
   changelog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Check if CHANGELOG.md changed

.github/workflows/commitlint.yml

@@ -7,7 +7,7 @@ jobs:
   commitlint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Validate Conventional Commits

.github/workflows/compatibility-matrix.yml

@@ -11,7 +11,7 @@ jobs:
       matrix:
         deps: [lowest, highest]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Detect minimum PHP from composer.json
         id: php_min
         run: |

.github/workflows/composer-validate.yml

@@ -9,7 +9,7 @@ jobs:
   composer-validate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Detect minimum PHP from composer.json
         id: php_min
         run: |

.github/workflows/coverage.yml

@@ -7,7 +7,7 @@ jobs:
   coverage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Detect minimum PHP from composer.json
         id: php_min
         run: |

.github/workflows/dco.yml

@@ -7,7 +7,7 @@ jobs:
   dco:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Validate DCO sign-off in commits

.github/workflows/docker.yml

@@ -7,7 +7,7 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Lint Dockerfile
         run: docker run --rm -i hadolint/hadolint hadolint --failure-threshold error - < .docker/Dockerfile
       - name: Validate compose

.github/workflows/duplication.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     continue-on-error: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Detect minimum PHP from composer.json
         id: php_min
         run: |

.github/workflows/github-meta.yml

@@ -7,7 +7,7 @@ jobs:
   github-meta:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: rhysd/actionlint@v1.7.1
       - name: Validate issue templates exist
         run: |