27.0.3

What's Changed

• Clarify purpose of migration guides by @leighmcculloch in #1916
• Refresh mainnet() resource limits and fees by @leighmcculloch in #1946
• BytesIter to read by index instead of re-slicing per byte (the VecTryIter approach) by @dkcumming in #1935
• Support unit structs as contract events by @leighmcculloch in #1917
• Document constructor auth mocking on register by @leighmcculloch in #1950
• Update SAC event doc-comments to CAP-67 shapes by @leighmcculloch in #1956
• Bump version to 27.0.3 by @github-actions[bot] in #1957

Full Changelog: v27.0.2...v27.0.3