Required validation is not working with checkboxes widget fields.

Problem/Motivation

• Checkbox widget field dependencies are not triggered in the required validation check (evaluateDependencies()).
• Sometimes $values is 0 for checkbox fields on validation ($evaluated_dependees)

Steps to reproduce

1. Create a visible form level dependency for the required field (target field), and select a checkbox field as the control field.
2. Set a condition like the screenshot attached.
3. now show/hide will work, required state will not work

Proposed resolution

Added a new condition for checkbox fields in evaluateDependencies()
src/ConditionalFieldsFormHelper.php

Remaining tasks

If needed implement the same for other field widgets.