Bump shivammathur/setup-php from 2.30.2 to 2.31.1

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.30.2 to 2.31.1.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.30.2...2.31.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup PHP
-        uses: shivammathur/setup-php@2.30.2
+        uses: shivammathur/setup-php@2.31.1
         with:
           php-version: ${{ matrix.php-versions }}
           extensions: mbstring