.pageanrc.json has invalid schema

See https://gitlab.com/gitlab-ci-utils/pagean/-/jobs/1709841807, which fails, and then the ODC checks are against nothing and pass, so the job fails, see https://gitlab.com/gitlab-ci-utils/pagean/-/jobs/1709841809.

Error:

$ pageanrc-lint .pageanrc.json

.pageanrc.json
  <pageanrc>.urls[8].settings.brokenLinkTest.checkWithBrowser  must NOT contain additional properties: "checkWithBrowser"
  <pageanrc>.urls[8].settings.brokenLinkTest                   must be either boolean or object with the appropriate properties
  <pageanrc>.urls[8]                                           must be either URL string or object with the appropriate properties

Fatal error - exiting (1)