Bump shivammathur/setup-php from 2.20.1 to 2.21.1 (#41)

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.20.1 to 2.21.1.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.20.1...2.21.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@2.20.1
+        uses: shivammathur/setup-php@2.21.1
         with:
           php-version: ${{ matrix.php }}
           extensions: zip, curl, xdebug

.github/workflows/pull_request.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@2.20.1
+        uses: shivammathur/setup-php@2.21.1
         with:
           php-version: ${{ matrix.php }}
           extensions: zip, curl, xdebug