Bump shivammathur/setup-php from 2.20.1 to 2.21.2 (#61)

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.20.1 to 2.21.2.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.20.1...2.21.2)

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

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

Author: dependabot[bot]

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Setup PHP
-      uses: shivammathur/setup-php@2.20.1
+      uses: shivammathur/setup-php@2.21.2
       with:
         php-version: '8.1'
         tools: cs2pr, phpcs
@@ -31,7 +31,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Setup PHP
-      uses: shivammathur/setup-php@2.20.1
+      uses: shivammathur/setup-php@2.21.2
       with:
         php-version: ${{ matrix.php-versions }}   
         tools: composer, phpbench/phpbench
@@ -51,7 +51,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Setup PHP
-      uses: shivammathur/setup-php@2.20.1
+      uses: shivammathur/setup-php@2.21.2
       with:
         php-version: ${{ matrix.php-versions }}   
         tools: composer, phpunit