pytket-braket 0.31.0

What's Changed

• Bump actions/checkout from 3 to 4 by @dependabot in #86
• Main by @cqc-alec in #85
• Clean up import. by @cqc-alec in #87
• mypy warn-unused-ignore by @cqc-melf in #88
• Make SimplifyInitial opt-in by @cqc-alec in #89
• fix mypy by @cqc-melf in #90
• Release/1.21.0 by @cqc-melf in #91

Full Changelog: v0.30.0...v0.31.0