chore(deps): bump nixpkgs from e7439b6 to 6510408 in the nix group (#23577)

Bumps the nix group with 1 update: [nixpkgs](https://github.com/NixOS/nixpkgs).


Updates `nixpkgs` from `e7439b6` to `6510408`
- [Commits](https://github.com/NixOS/nixpkgs/compare/e7439b6b14ad3cc35d05608ebca9bce01a25f5f8...6510408d147d8c5e6d76043e899e9251756f6a75)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 6510408d147d8c5e6d76043e899e9251756f6a75
  dependency-type: direct:production
  dependency-group: nix
...

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

flake.lock

@@ -278,11 +278,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1791456040,
-        "narHash": "sha256-H83yz/do+hjOO0uujHyH8RgtIQP2v7Mw+cLwcZK/xKc=",
+        "lastModified": 1791594108,
+        "narHash": "sha256-XK4KceonkwD8LuMAt/vNrz982mXJM5jeHAxMwsUXXAQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e7439b6b14ad3cc35d05608ebca9bce01a25f5f8",
+        "rev": "6510408d147d8c5e6d76043e899e9251756f6a75",
         "type": "github"
       },
       "original": {