Support cython>=3 and remove cython<3 pin.

[kbvw]

Fixes #2435

[azure-pipelines]

✔️ 97a56b2 -> Azure artifacts URL

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.28%. Comparing base (cdabc3c) to head (87a9524).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3028   +/-   ##
=======================================
  Coverage   67.27%   67.28%           
=======================================
  Files         571      571           
  Lines      104916   104909    -7     
=======================================
  Hits        70585    70585           
+ Misses      34331    34324    -7     

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CI went red.

[azure-pipelines]

✔️ fcb8af5 -> Azure artifacts URL

[azure-pipelines]

✔️ c8221ee -> Azure artifacts URL

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[azure-pipelines]

✔️ 87a9524 -> Azure artifacts URL

[bbpbuildbot]

Logfiles from GitLab pipeline #225882 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ✅ test:neuron:nmodl:nvhpc:acc:legacy
• ✅ test:neuron:nmodl:nvhpc:acc:shared
• ✅ test:neuron:nmodl:nvhpc:omp:legacy
• ✅ test:neuron:nmodl:nvhpc:omp

[1uc]

Seems like a sensible compromise between RXD using dlsym (hence language="c") and MUSIC that uses std::vector (therefore language="c++").