[CI][Python][Dev] Remove the Cython version pin

[hiroyuki-sato]

Describe the enhancement requested

Cython is currently pinned to 3.2.9 because cython-lint does not yet support Cython 3.3. #50986

Once cython-lint adds support for Cython 3.3, we should update cython-lint and remove the Cython version pin.

Reference

• AttributeError: 'DictComprehensionAppendNode' object has no attribute 'value_expr' with Cython 3.3.0 MarcoGorelli/cython-lint#201 (Issue)
• Fix/dict comprehension cython 3.3 MarcoGorelli/cython-lint#202 (PR)

Component(s)

Python, Continuous Integration