Allow rendering HTML in CheckboxList label

[CodeWithDennis]

Description

Allows you to use allowHtml() with the CheckboxList.

$this->allowHtml()
    ->getOptionLabelFromRecordUsing(function (Model $record) {
        return view('custom-view', [])->render();
    });

Visual changes

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.