v1.2.1: Support rails 7.1 (#169)
* Support rails 7.1 - clean up Github Action workflow file - allow rails 7.1.x - run tests with ruby 3.0, 3.1 and 3.2 * fix casing in Minitest constant
* Support rails 7.1 - clean up Github Action workflow file - allow rails 7.1.x - run tests with ruby 3.0, 3.1 and 3.2 * fix casing in Minitest constant