Bitcoin Core version 28.1 is now available from:
https://bitcoincore.org/bin/bitcoin-core-28.1/
For the release notes please see the git repository:
https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-28.1.md
Do not use the links provided by GitHub, rather use the above download links, they are guaranteed to be generated deterministically and signed.