Install PHP Dependencies with Composer

Version updated for ramsey/composer-install to version 3.0.0.

• This action is used across all versions by 12,106 repositories.

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Release notes

Changed

• Update actions/cache to v4 to avoid deprecation notices.

  This requires a new major version because actions/cache requires Node.js 20, which could cause backwards-compatibility breaks for any projects that require earlier versions of Node.js.

  For more details, see the discussion on #252.

• ramsey
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