pytket-projectq 0.30.0

What's Changed

• Main by @cqc-alec in #33
• Bump actions/checkout from 3 to 4 by @dependabot in #34
• fixmypy by @cqc-melf in #35
• Release/1.21.0 by @cqc-melf in #36

Full Changelog: v0.29.0...v0.30.0