8.x-1.0-alpha2 says it is compatible with D8, but requires 9.2 (@composer)

Problem/Motivation

I have a D8 site that has been using this module, but recently it started failing to build with composer. This turns out to be a result of the composer.json file in the root of datetime_range_timezone, which requires drupal/core:^9.2. Obviously a Drupal 8 site won't have a Drupal 9 core.

Steps to reproduce

• Install a clean D8 site.
• $ composer require "drupal/datetime_range_timezone":"8.x-1.0-alpha2"

Proposed resolution

Fix composer.json to allow Drupal 8 projects also.

Remaining tasks

User interface changes

API changes

Data model changes