Fix composer require for Drupal core to ~8.0 || ~9.0 to work with latest Drupal 9.1.x versions

Problem/Motivation

The composer has "drupal/core": "^8.8.0 || ~9.0.0",
which will not let the composer get the latest versions for Drupal 9.1.0

Proposed resolution

Change the composer require for Drupal core to
"drupal/core": "~8.0 || ~9.0",