py-cython: updated to 3.0.9

3.0.9 (2024-03-05)
==================

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
----------

* Cython generates incorrect (but harmless) self-casts when directly calling
  final methods of subtypes.  Lacking a better solution, the errors that recent
  gcc versions produce have been silenced for the time being.
  Original patch by Michał Górny.  (Github issue :issue:`2747`)

* Unused variable warnings about clineno were fixed when C lines in tracebacks are disabled.
  (Github issue :issue:`6035`)

* 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`)


(adam)