Remove cython pinning to < 3.1

[antonwolfy]

This PR reverts cython pinning added in #2441 which was added to unblock CI due to compilation error:

$SRC_DIR/_skbuild/linux-x86_64-3.9/cmake-build/dpnp/dpnp_utils/dpnp_algo_utils.cxx:28898:36: error: use of undeclared identifier '__pyx_convert__to_py___pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc'; did you mean '__pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc'?
 28898 |   __Pyx_TraceReturnCValue(__pyx_r, __pyx_convert__to_py___pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc, 21, 0, __PYX_ERR(0, 466, __pyx_L1_error));
       |                                    ^
$SRC_DIR/_skbuild/linux-x86_64-3.9/cmake-build/dpnp/dpnp_utils/dpnp_algo_utils.cxx:2104:89: note: '__pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc' declared here
 2104 | typedef struct __pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc __pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc;
      |                                                                                         ^
$SRC_DIR/_skbuild/linux-x86_64-3.9/cmake-build/dpnp/dpnp_utils/dpnp_algo_utils.cxx:28898:36: error: use of undeclared identifier '__pyx_convert__to_py___pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc'; did you mean '__pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc'?
 28898 |   __Pyx_TraceReturnCValue(__pyx_r, __pyx_convert__to_py___pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc, 21, 0, __PYX_ERR(0, 466, __pyx_L1_error));
       |                                    ^
$SRC_DIR/_skbuild/linux-x86_64-3.9/cmake-build/dpnp/dpnp_utils/dpnp_algo_utils.cxx:2104:89: note: '__pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc' declared here
 2104 | typedef struct __pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc __pyx_ctuple_4f2d56__4dpnp_9dpnp_algo_9dpnp_algo_enum__space_DPNPFu__etc;
      |                                                                                         ^
2 errors generated.

The error is caused by cython issue when line tracing is enabled and if there is ctuple returned.
It is proposed to disable line tracing per affected function to mitigate the compilation error.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[coveralls]

coverage: 71.711% (-0.07%) from 71.781%
when pulling fca3c91 on enable-cython-3.1
into 9792685 on master.

[github-actions]

Array API standard conformance tests for dpnp=0.18.0dev2=py312he4f9c94_10 ran successfully.
Passed: 1228
Failed: 1
Skipped: 9

[vlad-perevezentsev]

Thank you @antonwolfy !