python3-cython: upgrade 3.0.10 -> 3.0.11

The upstream package changed from uppercase to lowercase in "Cython", so
adjust PYPI_PACKAGE and the sed call in cython_fix_sources to match.

Changelog (https://github.com/cython/cython/releases/tag/3.0.11-1

):

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

* The C++11 ``emplace*`` methods were added to ``libcpp.deque``.
  Patch by Somin An.  (Github issue :issue:`6159`)

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

* The exception check value of functions declared in pxd files was not always applied in 3.0.10.
  (Github issue :issue:`6122`)

* A crash on exception deallocations was fixed.
  (Github issue :issue:`6022`)

* A crash was fixed when assigning a zero-length slice to a memoryview.
  Patch by Michael Man.  (Github issue :issue:`6227`)

* ``libcpp.optional.value()`` could crash if it raised a C++ exception.
  Patch by Alexander Condello.  (Github issue :issue:`6190`)

* The return type of ``str()`` was mishandled, leading to crashes with ``language_level=3``.
  (Github issue :issue:`6166`)

* ``bytes.startswith/endswith()`` failed for non-bytes substrings (e.g. ``bytearray``).
  (Github issue :issue:`6168`)

* Fused ctuples crashed Cython.
  (Github issue :issue:`6068`)

* A compiler crash was fixed when using extension types in fused types.
  (Github issue :issue:`6204`)

* The module cleanup code was incorrect for globally defined memory view slices.
  (Github issue :issue:`6276`)

* Some adaptations were made to enable compilation in Python 3.13.
  (Github issues :issue:`5997`, :issue:`6182`, :issue:`6251`)

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>