Bump shivammathur/setup-php from 2.15.0 to 2.21.1

[dependabot[bot]]

Bumps shivammathur/setup-php from 2.15.0 to 2.21.1.

Release notes

Sourced from shivammathur/setup-php's releases.

2.21.1

Support Ukraine

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• Fixed installing tools' old versions which are composer plugins.

• Updated Node.js dependencies.

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2.21.0

Support Ukraine

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• Added support for Laravel Pint #613, #614

- name: Setup PHP
  uses: shivammathur/setup-php@v2
  with:
    php-version: `8.1`
    tools: pint

• Added support for phalcon5 for all OS. shivammathur/homebrew-extensions#1890 Also fixed phalcon3 and phalcon4 support on Ubuntu 22.04.

- name: Setup PHP
  uses: shivammathur/setup-php@v2
  with:
    php-version: `8.1`
    extensions: phalcon5

• Added support for Private Packagist authentication for composer. Docs

... (truncated)

Commits

• 16011a7 Upgrade Node.js dependencies
• 66f2447 Fix reading composer package type for older versions
• e57ea71 Fix scoped tool setup on Windows
• e8ba27f Fail on npm audit again
• 945c34c Update README
• c8c64c6 Bump version to 2.21.0
• 0d3f92f Add support for phalcon5 on Windows
• 4979d5b Add workaround for missing phalcon packages on Ubuntu 22.04
• 0d9a1ba Add support for phalcon5 on Linux and macOS
• 3ede765 Add check for gd in php.yml
• Additional commits viewable in compare view

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