task: Support Drupal core ^11.4 || ^12

Problem/Motivation

composer.json and gherkin.info.yml constrain core to ~10.4.0 || ~11.0, blocking install on Drupal 11.4+ and Drupal 12.

Steps to reproduce

Try to require Gherkin Script on a Drupal 11.4 or 12 site; the core version constraint rejects it.

Proposed resolution

Widen both constraints to ^11.4 || ^12. CI already builds by default on Drupal 11 with PHP 8.4 (_TARGET_PHP: "8.4"), and runs Drupal 12 and the newest PHP as opt-in variant jobs (OPT_IN_TEST_NEXT_MAJOR, OPT_IN_TEST_MAX_PHP), allowed to fail.

AI-Generated: Yes

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ❌ Reviewed by a human
• ❌ Code review by maintainers
• ❌ Full testing and approval
• ❌ Credit contributors
• ❌ Review with the product owner
• ❌ Update Release Notes
• ✅ Release

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A