QCEC 2.0: Release Candidate 9

What's Changed

• 📌 More leniency on the qiskit-terra version by @burgholzer in #135
• 🐛 fix cpp-linter silently failing by @burgholzer in #136
• Bump extern/qfr from d550522 to ef83c0f by @dependabot in #137
• 🔧 Update CI with latest best practices by @burgholzer in #138
• 🚨 Further flake8 checks by @burgholzer in #139
• 🔧 Update nox sessions by @burgholzer in #140
• Bump pypa/cibuildwheel from 2.9.0 to 2.10.0 by @dependabot in #141
• Bump extern/qfr from ef83c0f to ae0b7c0 by @dependabot in #142
• 🐛 Fix potential underflow bug in max simulation computation by @burgholzer in #144
• ⬆️🪝 update pre-commit hooks by @pre-commit-ci in #145
• Documentation update by @burgholzer in #143

Full Changelog: v2.0.0-rc8...V2.0.0-rc9