Mainnet-beta - v2.0.15

This is a stable release suitable for use on Mainnet Beta.

What's Changed

• Bump version to v2.0.15 by @github-actions in #3210
• v2.0: Update latest release variable for agave docs (backport of #3220) by @mergify in #3221
• v2.0: ci: remove deprecated macos-12 image (backport of #3202) by @mergify in #3207
• v2.0: runtime: use leader schedule epoch to serve sol_get_epoch_stake (backport of #3279) by @mergify in #3312
• Pin SPL Token CLI version to v4.1.1 by @willhickey in #3344
• CI: Pin downstream SPL job to v2.0 branch by @joncinque in #3384
• Revert - #879 and #768 (v2.0 backport of #3521) by @Lichtso in #3511
• v2.0: Revert "rolls back chained Merkle shreds for testnet downgrade (#3194)" (backport of #3503) by @mergify in #3504
• v2.0: Store epoch in MaxAge (backport of #3485) by @mergify in #3501
• Feature - disable account loader special case by @Lichtso in #3514

Full Changelog: v2.0.14...v2.0.15