Migrate off of check-type dependency due to security vulnerability

[noahnu]

Expected behaviour

yaml-validator should not depend on vulnerable dependencies.

Actual behaviour

yaml-validator depends on check-type, last published 10 years ago. It is no longer maintained. It brings in underscore@1.6.0 which suffers from the security vulnerability: https://nvd.nist.gov/vuln/detail/CVE-2021-23358

Versions and environment

• Operating system:
• Node.js: lts/iron
• npm:
• yaml-validator:

Thank you and have some :grapes:.