niv niv: update 04c1cec1 -> 5f0defe2

## Changelog for niv:
Branch: master
Commits: [nmattia/niv@04c1cec1...5f0defe2](nmattia/niv@04c1cec...5f0defe)

* [`5f0defe2`](nmattia/niv@5f0defe) Bump cachix/install-nix-action from 26 to 27 ([nmattia/niv⁠#400](https://togithub.com/nmattia/niv/issues/400))

nix/sources.json

@@ -89,10 +89,10 @@
  "homepage": "https://github.com/nmattia/niv",
  "owner": "nmattia",
  "repo": "niv",
- "rev": "04c1cec14801d2b18fc1a771cf40cec249cb8670",
- "sha256": "1xl4mni4az9wiwq3ygk0f53gwkjw5pnfgrl69r5vwji2jqc96a11",
+ "rev": "5f0defe2f71020812e39a51dab68a64fb293ace1",
+ "sha256": "12wscam2163pirzbmz0pw6cmnn6xa0dy8ax5kxi5bgxcp728vxyd",
  "type": "tarball",
- "url": "https://github.com/nmattia/niv/archive/04c1cec14801d2b18fc1a771cf40cec249cb8670.tar.gz",
+ "url": "https://github.com/nmattia/niv/archive/5f0defe2f71020812e39a51dab68a64fb293ace1.tar.gz",
  "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
  },
  "nixpkgs": {