Release v4.2.0-rc.1

This is Mainnet-beta Upgrade Candidate release recommended for 10% adoption.
It is also recommended for Testnet and Devnet.

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

What's Changed

• v4.2: ClusterSlots: tighten slot support calculations (backport of #14223) by @mergify[bot] in #14226
• v4.2: replay: increase rayon pool stack size (backport of #14162) by @mergify[bot] in #14164
• v4.2: fix: bound wincode-related sdk deps to <= wincode 0.5.5 by @cpubot in #14178
• v4.2: civl: match shred ingest bound (backport of #14231) by @mergify[bot] in #14235

Full Changelog: v4.2.0-rc.0...v4.2.0-rc.1