sysvar@v4.1.0

What's new

• Publish solana-sysvar v4.1.0
• Add sysvar size consts (#786) by @grod220
• Scaffold crate extracted from solana-stake-interface by @grod220
• Extract from solana-sysvar (#770) by @grod220
• Enable frozen-abi feature by default (#763) by @kskalski
• Support wincode schemas for serializable types (#721) by @kskalski
• Add sha2 feature where needed (#678) by @abelmarnk