[TASK] Bump actions/checkout from 5 to 6 (#368)

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/check_history.yaml

@@ -9,7 +9,7 @@ jobs:
     name: 'Check if PR is based on latest main'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }} # ensure we get the actual PR HEAD and not the merged result
           fetch-depth: 0 # ensure the complete Git history is available
@@ -36,7 +36,7 @@ jobs:
     name: 'Check if PR has a linear history without merges'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }} # ensure we get the actual PR HEAD and not the merged result
           fetch-depth: 0 # ensure the complete Git history is available
@@ -60,7 +60,7 @@ jobs:
     name: 'Check if PR has any fixup! or WIP commits'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }} # ensure we get the actual PR HEAD and not the merged result
           fetch-depth: 0 # ensure the complete Git history is available

.github/workflows/docs.yaml

@@ -14,7 +14,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: "Setup PHP"
         uses: shivammathur/setup-php@v2

.github/workflows/lint_test_pull_requests.yaml

@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # see https://github.com/shivammathur/setup-php
       - name: "Setup PHP"
@@ -71,7 +71,7 @@ jobs:
           - 8.3
           - 8.4
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
 

.github/workflows/publish.yml

@@ -46,7 +46,7 @@ jobs:
     name: Split subtree packages/${{ matrix.package.path }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0 # ensure the complete Git history is available