fix: allow testing-framework ^9.0 for TYPO3 v14 compatibility

[CybotTM]

Summary

• Allow typo3/testing-framework ^9.0 alongside ^8.0.9 to fix composer dependency resolution when testing against TYPO3 dev-main (v14)

Problem

The tests-main and code-quality workflows fail with:

Your requirements could not be resolved to an installable set of packages.
  - typo3/testing-framework[8.0.9, ..., 8.3.1] require typo3/cms-backend 12.*.*@dev || 13.*.*@dev
    -> found typo3/cms-backend[...] but it conflicts with your root composer.json require (dev-main).

testing-framework 8.x only supports TYPO3 12/13. TYPO3 dev-main is now v14, which requires testing-framework 9.x.

Fix

Change constraint from "^8.0.9" to "^8.0.9 || ^9.0". Composer resolves the correct version automatically:

• 8.x when testing against TYPO3 12.4 or 13.x
• 9.x when testing against TYPO3 dev-main (v14)

Verified locally: composer update --dry-run succeeds and locks typo3/testing-framework 9.4.0.

Note: testing-framework 9.x requires PHP 8.2+, but the tests-main workflow already only runs on PHP 8.2/8.3.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves dependency conflicts encountered when testing against TYPO3 dev-main (v14) by expanding the allowed versions for the typo3/testing-framework package. This change ensures that Composer can correctly resolve dependencies, allowing the project to be tested against both older TYPO3 versions (12.4/13.x) and the upcoming v14.

Highlights

• Dependency Update: Updated the typo3/testing-framework dependency constraint in composer.json to allow version ^9.0 alongside ^8.0.9.
• TYPO3 v14 Compatibility: Ensured compatibility with TYPO3 dev-main (v14) by enabling the use of typo3/testing-framework 9.x, resolving previous composer dependency resolution failures.

Changelog

• composer.json
  • Updated the typo3/testing-framework dependency to include version ^9.0 for TYPO3 v14 compatibility.

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[gemini-code-assist]

Code Review

This pull request updates composer.json to allow typo3/testing-framework version ^9.0 alongside ^8.0.9. This is a necessary change to support testing against TYPO3 v14, which requires the newer version of the testing framework. The change is correct and allows Composer to resolve the appropriate dependency version based on the TYPO3 version being used. The implementation is sound and I have no further comments.

_{Note: Security Review has been skipped due to the limited scope of the PR.}