QCEC 2.1.0 Release Candidate 1

This is a pre-release to test the new Cirrus CI infrastructure for publishing Apple Silicon and Linux ARM wheels.

What's Changed

• 📦 Support Versioning in Git Archives by @burgholzer in #187
• ❄️ Potential fix for flaky Python test by @burgholzer in #189
• 🐍⚡🔧 Improve Python Testing Configuration by @burgholzer in #190
• 🔥 Remove retworkx requirement by @dependabot in #186
• ✨ Cirrus CI by @burgholzer in #192

Full Changelog: v2.0.0...v2.1.0-rc1