feishin: fix #455297 and 0.20.1 -> 0.21.2

[yuri-becker]

Fix for the issue described in #455297 and bumped the package version.

The last upgrade for Feishin in Nixpkgs broke the build for Darwin. Simply, this is because Feishin changed its build output - which was compensated for in the installPhase for Linux, but not for Darwin (see change in line 105 at https://github.com/NixOS/nixpkgs/pull/445926/files).

I also took the opportunity to update to the newest Feishin release, I hope that's okay.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[nolith]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 455302
Commit: 0fda0e38cfb6949fde8a0917fcd89f759b01de13

---

x86_64-darwin

✅ 1 package built:

• feishin

[nolith]

Tested on x86_64-darwin. The app works well.

Thanks for fixing this

[onny]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 455302
Commit: 0fda0e38cfb6949fde8a0917fcd89f759b01de13

---

x86_64-linux

✅ 1 package built:

• feishin

[onny]

Thank you!