v2.3.0a1

What's Changed

• Smbehaviour syntax by @garthwatney in #462
• Update the state machine specification for do actions as lists by @garthwatney in #482
• Rename enter exprs to transition exprs by @bocchino in #485
• New syntax impl by @garthwatney in #486
• Merge release/v2.2.1 into main by @bocchino in #538
• Upgrade CI to manylinux_2_28_x86_64 by @thomas-bc in #539
• Merge release/v2.2.1 into main by @bocchino in #540
• State Machines Phase 2 by @bocchino in #534
• Update version stamp on main branch by @bocchino in #543
• Fix diagram links in User's Guide by @bocchino in #546
• Update version stamp on release branch by @bocchino in #542
• Add unit tests for state machine semantics by @bocchino in #544
• Merge release/v2.2.1 into main by @bocchino in #547

Full Changelog: v2.2.1a2...v2.3.0a1