Bump actions/checkout from 5 to 6

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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout php-bsdiff
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
@@ -28,7 +28,7 @@ jobs:
     runs-on: macos-15
     steps:
       - name: Checkout php-bsdiff
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
@@ -63,7 +63,7 @@ jobs:
     runs-on: ${{matrix.os}}
     steps:
       - name: Checkout php-bsdiff
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup PHP
         id: setup-php
         uses: php/[email protected]