chore(deps): bump nixpkgs from `e7a3ca8` to `18b9261` (#22727)

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `e7a3ca8` to `18b9261`.
- [Commits](e7a3ca8092...18b9261cb3)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 18b9261cb3294b6d2a06d03f96872827b8fe2698
  dependency-type: direct:production
...

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

flake.lock

@@ -277,11 +277,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1783776592,
-        "narHash": "sha256-UgCQzxeWI75XM8G+hPrPh+MKzEPjG3SpAj7dtqSbksA=",
+        "lastModified": 1784007870,
+        "narHash": "sha256-djcLt/JJphyNt4eDY9XTly+/WbCK5lqWq9lSgCmJkkQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e7a3ca8092b61ff85b6a45bf863ea2b2d6a661b3",
+        "rev": "18b9261cb3294b6d2a06d03f96872827b8fe2698",
         "type": "github"
       },
       "original": {