Bump shivammathur/setup-php from 2.27.1 to 2.28.0

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.27.1 to 2.28.0.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.27.1...2.28.0)

---
updated-dependencies:
- dependency-name: shivammathur/setup-php
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/CI.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - uses: shivammathur/setup-php@2.27.1
+      - uses: shivammathur/setup-php@2.28.0
         with:
           php-version: ${{ matrix.php }}
           coverage: none