Use archives.boost.io instead of jfrog for fetching boost

Summary:
X-link: https://github.com/facebookincubator/zstrong/pull/667

X-link: https://github.com/facebook/wangle/pull/224

AIRStore's contbuild broke a few days ago with a failure to unpack the boost tarball. This is because boost's jfrog subscription expired. The recommended workaround is to use `archive.boost.io` instead. The checksums are the same. https://github.com/facebook/react-native/issues/42180

Reviewed By: chadaustin

Differential Revision: D52612598