doublezero-solana/v0.5.12

Changelog

• a6f7f26 Remove doublezero-solana shreds pay (#415)
• c502659 Remove the fund-seat instruction from the Solana SDK (#416)
• 7db4832 contributor-rewards, solana-cli, validator-debt: fix the hardcoded 400ms slot times (#411)
• ceeee22 contributor-rewards: add golden tests covering reward values (#414)
• 8004775 contributor-rewards: fail the tick instead of saving a snapshot with no leader schedule (#413)
• 0c84bde repo: point this repo and its doublezero-solana deps at the malbeclabs org (#412)
• 19fb8e1 shreds pay: confirm the fastshreds.com transition before paying (#407)
• 2499664 solana-cli: uptick crate to v0.5.12 (#417)
• 8236fce solana-client-tools: add a payload budget and a checked encoder for Squads vaults (#409)
• f48c823 solana-client-tools: add squads module for Squads v4 vault support (#408)
• 3010b57 solana-sdk: mirror ValidatorClientRewards as a zero-copy struct (#410)