Replace deprecated/removed usage of hook_field_widget_WIDGET_TYPE_form_alter

• This change will require the dropping of support for versions of Drupal prior to 9.2
• Please re-roll this change in a merge request so that GitLabCI tests will run against it.

Also, I updated the issue description with links to the supporting docs.

Hi @markdorison

I have added above changes into MR, please review.

I am planning to commit the changes in MR 13 and create a new release. That said, these changes drop support for Drupal < 9.2. Since all of the versions we are dropping have already reached end-of-life, I don't feel it's necessary to create a new major version of the module but I wanted to share these intentions here first in case anyone would like to weigh in in one direction or another.

Committed the changes from MR13 and I will cut a new release. Thanks for the help, and hi @inglesaaron, I am just now seeing you up there! 😁👋

Automatically closed - issue fixed for 2 weeks with no activity.