Bitcoin Core version 28.0 is now available from:

https://bitcoincore.org/bin/bitcoin-core-28.0/

For the release notes please see the git repository:

https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-28.0.md

Do not use the links provided by GitHub, rather use the above download links, they are guaranteed to be generated deterministically and signed.