Update cython to 3.0.9

[pyup-bot]

This PR updates Cython from 3.0.7 to 3.0.9.

Changelog

3.0.9

==================

Features added
--------------

* Assigning ``const`` values to non-const variables now issues a warning.
(Github issue :issue:`5639`)

* Using ``noexcept`` on a function returning Python objects now issues a warning.
(Github issue :issue:`5661`)

* Some C-API usage was updated for the upcoming CPython 3.13.
Patches by Victor Stinner et al.  (Github issues :issue:`6003`, :issue:`6020`)

* The deprecated ``Py_UNICODE`` type is no longer used, unless required by user code.
(Github issue :issue:`5982`)

* ``std::string.replace()`` declarations were added to libcpp.string.
Patch by Kieran Geary.  (Github issue :issue:`6037`)

Bugs fixed
----------

* Unused variable warnings about clineno were fixed.

* Subclass deallocation of extern classes could crash if the base class uses GC.
Original patch by Jason Fried.  (Github issue :issue:`5971`)

* Type checks for Python ``memoryview`` could use an invalid C function.
Patch by Xenia Lu.  (Github issue :issue:`5988`)

* Calling final fused functions could generate invalid C code.
(Github issue :issue:`5989`)

* Declaring extern enums multiple times could generate invalid C code.
(Github issue :issue:`5905`)

* ``pyximport`` used relative paths incorrectly.
Patch by Stefano Rivera.  (Github issue :issue:`5957`)

* Running Cython with globbing characters (``[]*?``) in the module search path could fail.
Patch by eewanco.  (Github issue :issue:`5942`)

* Literal strings that include braces could change the C code indentation.

Other changes
-------------

* The "enum class not importable" warning is now only issued once per enum type.
(Github issue :issue:`5941`)

3.0.8

==================

Bugs fixed
----------

* Using ``const`` together with defined fused types could fail to compile.
(Github issue :issue:`5230`)

* A "use after free" bug was fixed in parallel sections.
(Github issue :issue:`5922`)

* Several types were not available as ``cython.*`` types in pure Python code.

* The generated code is now correct C89 again, removing some C++ style ``//`` comments
and C99-style declaration-after-code code ordering.  This is still relevant for some
ols C compilers, specifically ones that match old Python 2.7 installations.

Links

• PyPI: https://pypi.org/project/cython
• Changelog: https://data.safetycli.com/changelogs/cython/
• Homepage: https://cython.org/