This is a testnet release.

https://github.com/anza-xyz/agave/blob/v4.2/CHANGELOG.md

What's Changed

• transaction-status: fix parsed account labels for confidential transfer Deposit and Withdraw by @gitteri in #13149
• blockstore: Remove bincode support in Rewards column by @steviez in #13196
• rpc-client: Add method to get latest blockhash with response context (notably context.slot) by @GabrielePicco in #12826
• XDP by default by @alexpyattaev in #12119
• xdp: use af-xdp for gossip egress traffic by @KirillLykov in #13141
• cleanup(accounts-db): rip out StorageAccess::Mmap by @kskalski in #12443
• Replaces --accounts-db-cache-limit-mb with --accounts-db-write-cache-limit by @brooksprumo in #13251
• Promote PoH pinned CPU core flag by @gregcusack in #13191
• turbine: tighter filter of shred admission by @alexpyattaev in #12654
• Update cli to support alpenglow votes and epoch credits by @akhi3030 in #12872
• remote-wallet: support keystone by @ww3512687 in #11944

Full Changelog: v4.1.1...v4.2.0-beta.0