Fix: Add scssphp 2.x compatibility while maintaining backward compatibility

[Be-Mann]

Summary

This PR adds compatibility with scssphp 2.x while maintaining backward compatibility with scssphp 1.x.

Problem

The current implementation uses Compiler::getParsedFiles() which was removed in scssphp 2.0. This causes a fatal error when using mrclay/minify with scssphp 2.x:

Fatal error: Call to undefined method ScssPhp\ScssPhp\Compiler::getParsedFiles()
in vendor/mrclay/minify/lib/Minify/ScssCssSource.php

Since scssphp 2.x is required for PHP 8.5 compatibility, this fix is necessary for future PHP versions.

Changes

• Updated Minify_ScssCssSource::compile() to use CompilationResult::getIncludedFiles() for scssphp 2.x
• Falls back to Compiler::getParsedFiles() for scssphp 1.x (runtime detection via method_exists())
• The new scssphp 2.x API returns file paths only, so modification times are now retrieved via filemtime()
• Updated composer.json to allow scssphp/scssphp: ^1.12|^2.0

Related Issues

Fixes #715

[glensc]

1. you should not bump version in a feature pr
2. you should not create pull request from master branch
3. you should keep your commits atomic: https://www.freshconsulting.com/insights/blog/atomic-commits/

so, in this manner, should drop 7157647 commit, but i'm trying to merge and release this with browser only.

[Be-Mann]

so, in this manner, should drop 7157647 commit, but i'm trying to merge and release this with browser only.

First of all, thank you for that.

1. you should not bump version in a feature pr
2. you should not create pull request from master branch
3. you should keep your commits atomic: https://www.freshconsulting.com/insights/blog/atomic-commits/

Thank you, I will take this to heart and keep it in mind for the future.