ci: Update ISPC 1.20.0 macOS binary hashes
The ISPC 1.20.0 release page on GitHub replaced existing macOS release binaries with new ones. Update the hashes added by !8466 (merged).
A GitLab update will be applied on May 9th, between 8am and 10am, EDT (UTC-04:00). This site may have intermittent delays during that time.
The ISPC 1.20.0 release page on GitHub replaced existing macOS release binaries with new ones. Update the hashes added by !8466 (merged).