Revert "python: XStatic-Bootstrap: 3.3.7.1 -> 4.1.3.1"

[ajs124]

Motivation for this change

xstatic-bootstrap was bumped in #71893
This broke bepasty, because bepasty currently depends on xstatic-bootstrap < 4.
bepasty is the only package in nixpkgs that depends on xstatic-bootstrap.

There is an upstream issue here, but I don't think anyone is working on this right now.

Assuming this will get merged, it will also need a backport to 20.03.

In that case, it's also relevant to ZHF aka #80379.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• 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 nixpkgs-review --run "nixpkgs-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.

cc @Lassulus (you use this, right?)
cc @FRidh (you committed this)
cc @ThomasWaldmann (upstream, will this change any time soon?)

[makefu]

If required we could also split xstatic-bootstrap into xstatic-bootstrap3 and the latest package or override it just for bepasty.

[FRidh]

Fixed with 73fa456

[ajs124]

@FRidh should I open a PR against 20.03 with 73fa456?