Use proper required checkboxes syntax

[HonkingGoose]

• [x] I provide my work under the project license.
• [x] I grant such license of my work as is required for the purposes of future print editions to Ben Straub and Scott Chacon.

Changes

• Use proper required checkboxes syntax

Context

The old forms are not properly forcing some checkboxes to be ticked before proceeding, this PR makes it so that we properly force the checkboxes. 😄

Turns out you need to put the required: true value under the option key, not in a separate validations key... 😄

Example of invalid syntax:

  - type: checkboxes
    attributes:
      label: There's no existing/similar bug report.
      description: Please search to see if an issue already exists for the bug you encountered.
      options:
        - label: I have searched the existing issues
    validations:
      required: true

Example of correct syntax:

  - type: checkboxes
    attributes:
      label: There's no existing/similar bug report.
      description: Please search to see if an issue already exists for the bug you encountered.
      options:
        - label: I have searched the existing issues
          required: true