Symengine

What's Changed
* cython 3.1 fixes by isuruf in https://github.com/symengine/symengine.py/pull/494 and by bjodah in https://github.com/symengine/symengine.py/pull/500
* update symengine c++ to 0.14.0 by isuruf in https://github.com/symengine/symengine.py/pull/502 and https://github.com/symengine/symengine.py/pull/503
* Freethreading support by isuruf in https://github.com/symengine/symengine.py/pull/495
* Fix build with spaces by aaron-skydio in https://github.com/symengine/symengine.py/pull/499
* Update README with verification instructions by firatbezir in https://github.com/symengine/symengine.py/pull/501

Contributors
* Isuru Fernando
* Aaron Miller
* Ondřej Čertík
* Björn Dahlgren
* Firat Bezir

**Full Changelog**: https://github.com/symengine/symengine.py/compare/v0.13.0...v0.14.0

- Mark subs as throwing exceptions - 487
- Fix cython syntax, add tests - 481
- build(cmake): avoid the usage of distutils - 478
- Raise error on wrong number of arguments to Function and add name property - 466
- Implement unary addition - 465
- add `DenseMatrixBase.__abs__` - 458

People who contributed to the release:
* Björn Dahlgren
* Isuru Fernando
* Moraxyc

Breaking changes

- Require python>=3.8 - 452 453

Bug Fixes

- Cython3 support - 444
- Define `__floor__`, `__mod__`, `__divmod__` for basic - 441
- Add `as_powers_dict` - 44
- ci: Add Python 3.12 to the testing - 451

People who contributed to the release:
* Isuru Fernando
* Björn Dahlgren
* Christian Clauss
* Ondřej Čertík

Build system
- Fix building with LLVM 16 437

Breaking changes
- Change lambdify's default for backend to llvm when available - 431
- Converting ImmutableMatrix to sympy/sage results in immutable matrices - 392

Bug Fixes
- Add workaround for symbol class leak - 403
- Fix converting atan2 to sympy - 435
- Fix conversion of large integers - 426
- Improve symengine import time - 417
- Fix build to avoid duplicate files in wheel - 402
- Raise TypeError for bool(Booleans) except true, false - 401
- Fix converting doubles - 399

New Features
- Add a lambdify func. that throws ModuleNotFoundError when numpy missing - 432

People who contributed to the release:
* Isuru Fernando
* Michał Górny
* Pieter Eendebak
* Christian Clauss
* Rikard Nordgren
* Björn Dahlgren

Bug Fixes
- Bumped the version number which was forgotten in v0.9.1

Bug Fixes
- Fixed an issue with pip/setuptools builds