We recently added `POST` request support to livecheck but related cask
checks are failing the `livecheck_https_availability` audit because it
calls `validate_url_for_https_availability` which calls
`Utils::Curl.curl_check_http_content` and that checks the URL using a
`GET` request. Adding `POST` request support to all of those methods
will take some work, so this adds a guard to skip the audit if the
`livecheck` block uses `post_form` or `post_json`. This isn't ideal
but it will allow us to add these `livecheck` blocks in the interim
time.
Co-authored-by: Douglas Eichelberger <d@eic.email>