Update SiteSpeed image tag for CI check
Remove pinned version now that's the SiteSpeed issue has been fixed https://github.com/sitespeedio/sitespeed.io/issues/4062#issuecomment-1898420951
Edited by Nailia Iskhakova (OOO)
Remove pinned version now that's the SiteSpeed issue has been fixed https://github.com/sitespeedio/sitespeed.io/issues/4062#issuecomment-1898420951