Cover worker_support in update-bcd

See https://github.com/openwebdocs/mdn-bcd-collector/blob/18c9eb5bc2c7c6b45b7137f346c5eb08bda29be7/untestable-features.jsonc#L210C6-L210C97

"Worker support; technically already tested, but update-bcd doesn't know how to update these."