Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

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@v6
+        uses: actions/checkout@v7
       - 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@v6
+        uses: actions/checkout@v7
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
@@ -50,7 +50,7 @@ jobs:
     runs-on: windows-2022
     steps:
       - name: Checkout php-bsdiff
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       # Packaging and artifact upload are handled automatically by the builder.
       # See https://github.com/php/php-windows-builder
       - name: Build the extension