Update the Gin Admin Theme from ~3 to ~4

Problem/Motivation

Gin 4.0.0 was released on: 20 Dec 2024 by: saschaeggi
https://www.drupal.org/project/gin/releases/4.0.0

Followed up with
Gin 4.0.1 was released on: 27 Dec 2024
https://www.drupal.org/project/gin/releases/4.0.0

Gin 4.0.2 was released on: 28 Dec 2024
https://www.drupal.org/project/gin/releases/4.0.0

Proposed resolution

• Change drupal/gin to ~3 || ~4
• Change drupal/gin_toolbar to ~1 || ~2
• #3456376: Add support for Gin ^3 || ^4

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 varbase-10.0.4, varbase_core-10.0.43

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 #3496408: Updated the Gin Admin Theme from ~3 to ~4