Mark versions 1 and 2 to only support Drupal core 11.1 or below Primary tabs

Problem/Motivation

Gin Toolbar 1 and 2 only support Drupal core up to version 11.1 or earlier.

As of Drupal 11.2, Gin Toolbar 3 is being required.

Proposed solution

Tagging new versions:

• 3.0.0: supporting Drupal 11.2 and later
• 2.1.0: supporting Drupal 9, 10, 11.0, and 11.1
• 8.x-1.1: supporting Drupal 9, 10, 11.0, and 11.1

At the same time, the following versions will be unsupported:

• 2.0
• 8.x-1.0

This will force current installations to update to 1.1.0 or 2.1.0, and Drupal 11.2 installations will have to go to 3.0.0