update nix dependencies with niv-update

* changes to nix-build output:

No version or selection state changes.
Closure size: 26 -> 26 (3 paths added, 3 paths removed, delta +0, disk usage +0B).

* changes to nix-shell output:

Version changes:
[U.]    bifunctors     5.6.1, 5.6.1-doc -> 5.6.2, 5.6.2-doc
[U*]    cabal-install  3.10.2.1, 3.10.2.1-doc -> 3.10.3.0, 3.10.3.0-doc
[U.]    http-client    0.7.16, 0.7.16-doc -> 0.7.17, 0.7.17-doc
[U.]    invariant      0.6.2, 0.6.2-doc -> 0.6.3, 0.6.3-doc
[U.]    libyaml        0.1.2, 0.1.2-doc -> 0.1.4, 0.1.4-doc
[U.]    th-compat      0.1.4, 0.1.4-doc -> 0.1.5, 0.1.5-doc
[U*]    vscodium       1.87.2.24072 -> 1.88.0.24096
Added packages:
[A.]    Cabal         3.10.3.0, 3.10.3.0-doc
[A.]    Cabal-syntax  3.10.3.0, 3.10.3.0-doc
[A.]    libyaml-clib  0.2.5
Closure size: 1131 -> 1136 (189 paths added, 184 paths removed, delta +5, disk usage +349.8MiB).

nix/sources.json

@@ -5,10 +5,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ff0dbd94265ac470dda06a657d5fe49de93b4599",
-        "sha256": "1jddrr9m3pr578aya67w1mn720szfjn3k1vxywywjf25x8sn4ak9",
+        "rev": "cfd6b5fc90b15709b780a5a1619695a88505a176",
+        "sha256": "08yjq1miiy24j5jr4skma0ah4brjiswg6wzlas4dg582z05bvaaq",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/ff0dbd94265ac470dda06a657d5fe49de93b4599.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/cfd6b5fc90b15709b780a5a1619695a88505a176.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "olderIdeaNixpkgs": {