pythonPackages.cython: 0.29.1 -> 0.29.2

[dtzWill]

Motivation for this change

We ("we", probably our fearless python maintainer is what I mean) looked
into 0.29.2 earlier -- I have dangling git commits indicating as much...
but can't find discussion so submitting anyway.

Apologies if not useful or if I'm blind :P.

https://github.com/cython/cython/blob/0.29.2/CHANGES.rst

numpy 1.16.0 mentions needing cython >= 0.29.2, FWIW (#53976)

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

[FRidh]

I included it in #53445. I'll push all commits, except the actual strictDeps change.

[FRidh]

This is now in staging.