program@v2.1.1

What's new

• Release
• Cap increase to 50 basis points
• Fix fee check
• Use saturating math for reserve accounting (#721) by @joncinque
• Update solana-security-txt (#662) by @2501babe
• Expose check_manager_fee_info as pub for cross-program use (#622) by @aoikurokawa
• Use Rent over rent_exempt_reserve (#615) by @2501babe
• Revert "build(deps): bump spl-pod from 0.7.1 to 0.8.0 (#596)" (#600) by @joncinque
• Bump solana crates (#559) by @joncinque
• Fixup tests to work with all stake programs (#557) by @joncinque
• Use bpf stake (#424) by @2501babe
• Update toolchains and time (#554) by @joncinque
• Add unit tests to cover code changes introduced in v2.0.4 (#511) by @juliaaschmidt
• Add some missing tests that were already planned via // TODO (#470) by @juliaaschmidt
• Move repo to use a Makefile (#473) by @joncinque
• Merge commit from fork by @joncinque