Bump shivammathur/setup-php from 2.22.0 to 2.23.0 (#12)

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.22.0 to 2.23.0.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.22.0...2.23.0)

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

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Author: dependabot[bot]

.github/workflows/on_pull_request.yml

@@ -29,7 +29,7 @@ jobs:
     name: PHP ${{ matrix.php }}; ${{ matrix.os }}
     steps:
       - name: Setup PHP
-        uses: shivammathur/setup-php@2.22.0
+        uses: shivammathur/setup-php@2.23.0
         with:
           php-version: ${{ matrix.php }}
           extensions: curl, json, mbstring, pcre