Release v4.2.0-beta.2

This is a testnet release.

What's Changed

• v4.2: Loads accounts in parallel for lt hash updates of stake accounts (backport of #13696) by @mergify[bot] in #13752
• v4.2: receive_and_buffer: remove expensive status-cache check (backport of #13437) by @mergify[bot] in #13703
• v4.2: xdp: improve packet drop perf (backport of #13658) by @mergify[bot] in #13723
• v4.2: status_cache: use SmallVec instead of Vec for tx fork status (backport of #13876) by @mergify[bot] in #13893
• v4.2: Handle dead keys secondary (backport of #13717) by @mergify[bot] in #13818

Full Changelog: v4.2.0-beta.1...v4.2.0-beta.2