[BREAKING] Add PHP 8.1+ support (drops PHP 7.4)

[bensinclair]

Add PHP 8.1+ support

Summary

This PR upgrades the tithely/exo repository to support PHP versions 8.0 through 8.4+ by:

1. Updating PHP constraints: Changed from >=7.4 <8.5 to >=8.0 (open-ended, dropping PHP 7.4 support)
2. Expanding CI matrix: Now tests against PHP 8.0, 8.1, 8.2, 8.3, and 8.4 (previously only 7.4 and 8.0)
3. Updating dependencies: Updated 28 packages to their latest compatible versions, including PHPUnit 9.5.10 → 9.6.23
4. Fixing GitHub Actions: Updated deprecated actions/checkout@v2 and actions/cache@v2 to v4
5. Resolving compatibility issues: Added explicit version constraints for doctrine/instantiator ^1.5 and symfony/deprecation-contracts ^2.4 to maintain PHP 8.0 compatibility

All 20 CI checks now pass across the full PHP version matrix with both MySQL and PostgreSQL databases.

Review & Testing Checklist for Human

• Test core migration functionality manually across different PHP versions (8.0, 8.2, 8.4) to ensure no regression in actual usage
• Verify dependency updates don't introduce breaking changes by testing migration creation, execution, and rollback scenarios
• Check for deprecation warnings when running the library with the updated dependencies, especially PHPUnit and Symfony components
• Validate that the open-ended PHP constraint aligns with the project's maintenance strategy and ability to support future PHP versions
• Test edge cases and error handling that may not be covered by the existing test suite (many integration tests require database setup)

Recommended test plan: Set up test databases locally, create sample migrations, and verify they work correctly across PHP 8.0, 8.2, and 8.4 with both MySQL and PostgreSQL.

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    composer["composer.json<br/>PHP constraints & deps"]:::major-edit
    lock["composer.lock<br/>Dependency versions"]:::major-edit
    ci[".github/workflows/tests.yml<br/>CI matrix & actions"]:::major-edit
    
    deps["Dependencies<br/>(28 packages updated)"]:::context
    phpunit["PHPUnit 9.5.10 → 9.6.23"]:::context
    doctrine["doctrine/instantiator<br/>2.0.0 → 1.5.0"]:::context
    symfony["symfony/deprecation-contracts<br/>v3.6.0 → v2.5.4"]:::context
    
    composer --> deps
    composer --> doctrine
    composer --> symfony
    lock --> phpunit
    ci --> "PHP 8.0-8.4 testing"
    
    subgraph Legend
        L1["Major Edit"]:::major-edit
        L2["Minor Edit"]:::minor-edit  
        L3["Context/No Edit"]:::context
    end

classDef major-edit fill:#90EE90
classDef minor-edit fill:#87CEEB
classDef context fill:#FFFFFF

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Notes

• Session details: Requested by Ben Sinclair (@bensinclair) - Devin session
• Breaking change: Drops PHP 7.4 support (now requires PHP 8.0+)
• Dependency management: The manual addition of version constraints for doctrine/instantiator and symfony/deprecation-contracts was necessary to prevent PHP 8.1+ dependencies from breaking PHP 8.0 compatibility
• Test limitations: Local test suite shows 21 failures due to missing tests/db.yml configuration, so CI validation is critical for database-dependent functionality

[devin-ai-integration]

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[bensinclair]

Please address this error in all the Github actions tests.

Error: This request has been automatically failed because it uses a deprecated version of actions/cache: v2. Please update your workflow to use v3/v4 of actions/cache to avoid interruptions. Learn more: https://github.blog/changelog/2024-12-05-notice-of-upcoming-releases-and-breaking-changes-for-github-actions/#actions-cache-v1-v2-and-actions-toolkit-cache-package-closing-down

[bensinclair]

I remove the explicit PHP version from composer.json (see 3ebbec9) and need you to update composer.

[Copilot]

Pull Request Overview

This PR modernizes the PHP version support by dropping PHP 7.4 and adding support for PHP 8.1-8.4. The main driver was resolving a dependency conflict with phpspec/prophecy that prevented PHP 8.2+ usage.

• Upgraded minimum PHP requirement from 7.4 to 8.0 and added support through 8.4
• Resolved phpspec/prophecy dependency constraint blocking PHP 8.2+
• Updated CI matrix to test all supported PHP versions with MySQL and PostgreSQL

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
composer.json	Updated PHP requirement to >=8.0, added explicit phpspec/prophecy ^1.22.0 and additional dev dependencies
.github/workflows/tests.yml	Expanded CI matrix to test PHP 8.0-8.4 and updated GitHub Actions to v4