Add support for Drupal ~10 to smooth upgrades to latest Drupal versions

Problem/Motivation

Drupal 9 is end of life - PSA-2023-11-01

Drupal 10.2.0 stable is about to be released in 2 or 3 weeks

Proposed resolution

• Change drupal/core to ~8 || ~9 || ~10 in the .info.yml and composer.json files.

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
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release vartheme-8.x-6.12

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3405315: Added support for Drupal ~10 to smooth upgrades to latest Drupal versions