Cannot Install Module (Composer throws Error)

Problem/Motivation

The module cannot be installed and throws error

  Problem 1
    - Root composer.json requires drupal/content_notification ^2.5 -> satisfiable by drupal/content_notification[2.5.0].
    - drupal/content_notification 2.5.0 requires drupal/core ~8 -> found drupal/core[8.0.0-beta6, ..., 8.9.20] but these were not loaded, likely because it conflicts with another require.

You can also try re-running composer require with an explicit version constraint, e.g. "composer require drupal/content_notification:*" to figure out if any version is installable, or "composer require drupal/content_notification:^2.1" if you know which you need.

Steps to reproduce

composer require drupal/content_notification

Proposed resolution

The dependency here restricts the module from installing. So, I believe it needs to be changed here.

Remaining tasks

User interface changes

API changes

Data model changes