BREAKING: Update minimum PHP version to 8.1 and PHPUnit to 10 (v4.0.0)

[tomaj]

Summary

This is a major version bump to 4.0.0 with breaking changes. Updates minimum PHP version to 8.1 and PHPUnit to 10.5.53.

Breaking Changes

⚠️ BREAKING CHANGES:

• Minimum PHP version: 7.4 → 8.1
• Dropped support: PHP 7.4 and 8.0 no longer supported
• PHPUnit update: 9.6.25 → 10.5.53 (requires PHP 8.1+)

Changes

Added

• Support for latest PHPUnit 10.5.53 features and improvements

Changed

• 🔥 BREAKING: Minimum PHP version increased from 7.4 to 8.1
• 📦 PHPUnit updated from 9.6.25 to 10.5.53
• 🔧 phpunit.xml.dist updated to PHPUnit 10.5 schema format
• ⚙️ CI matrix now tests only PHP 8.1, 8.2, and 8.3
• 📋 Coverage configuration restructured for PHPUnit 10

Removed

• 🔥 BREAKING: Dropped support for PHP 7.4 and 8.0

Migration Guide

Projects using this library will need to:

1. Update PHP version to 8.1 or higher
2. Update composer.json:

   "require": {
     "php": ">=8.1",
     "tomaj/bank-mails-parser": "^4.0"
   }

3. Projects that cannot upgrade PHP should stay on version 3.x

Technical Details

• PHPUnit 10 requires PHP 8.1+ (this was the blocking issue)
• All existing tests pass without any code changes
• Coverage reporting continues to work as expected
• No changes to public API - only infrastructure upgrades

Testing

✅ All 39 tests pass successfully on PHP 8.1+:

PHPUnit 10.5.53 by Sebastian Bergmann and contributors.
.......................................   39 / 39 (100%)
Time: 00:00.155, Memory: 82.03 MB
OK (39 tests, 333 assertions)

Version Strategy

• v3.x: Last version supporting PHP 7.4+ (maintenance only)
• v4.x: New major version supporting PHP 8.1+ with modern tooling