chore(deps): bump nixpkgs from dc5d91f to 6774f7b in /nix (#6064)

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `dc5d91f` to `6774f7b`.
- [Commits](https://github.com/NixOS/nixpkgs/compare/dc5d91f840324650bac8c379428c7037a416959a...6774f7bc253789b113a4f39285dc0fa100abeacc)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 6774f7bc253789b113a4f39285dc0fa100abeacc
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

nix/flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1788752844,
+        "lastModified": 1790046670,
-        "narHash": "sha256-VaWGJ6+cIYN2erfSecbRV+4ljI185Ty2wUrXyvQbgOw=",
+        "narHash": "sha256-MYiI+CzL0tuWgRPjGsKCDHqYs2T3OzMlMQWOYWG0qso=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "dc5d91f840324650bac8c379428c7037a416959a",
+        "rev": "6774f7bc253789b113a4f39285dc0fa100abeacc",
         "type": "github"
       },
       "original": {