[staging]python3Packages.pytest: 5.1.0 -> 5.2.1

[jonringer]

Motivation for this change

python38Packages.pytest was broken, decided to bump while fixing

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 nix-review --run "nix-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)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Notify maintainers

cc @

[jonringer]

@GrahamcOfBorg build python38Packages.pytest

[FRidh]

#71222

[FRidh]

will need to cherrypick importlib into it

[jonringer]

holy f**king commits... 231.... wow, you've been busy

[FRidh]

many are automatically generated. Likely causes quite the breakage again.

[jonringer]

I'll just review your pr then

[jonringer]

@FRidh do you mind if I push fixes to the python-unstable branch? or does that disrupt your work flow?

[FRidh]

no, go ahead

Builds are happening at https://hydra.nixos.org/jobset/nixpkgs/python-unstable but Hydra is a bit loaded at the moment (and importlib-metadata is another rebuild again :)).

[jonringer]

sounds good

[FRidh]

networkx will release a new version any day now so lets ignore that its tests fail on 3.8.