chore: update flake.lock (#1401)

Floatpane Bot created 

## What?

Updates `flake.lock` to the latest revisions of all flake inputs
(`nixpkgs`, `flake-utils`, etc.).

## Why?

Keeps Nix inputs current so contributors and CI build against fresh
`nixpkgs`. Picks up upstream security and toolchain fixes. Generated
automatically by the flake-lock update workflow on changes to `go.sum`.

Change summary

flake.lock | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

Detailed changes

flake.lock 🔗 

@@ -59,11 +59,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1780030872,
-        "narHash": "sha256-u6WU/yd/o8iYQrHX3RAwO1hYa3LkoSL+WNQD0rJfJZQ=",
+        "lastModified": 1780246643,
+        "narHash": "sha256-4T1KWX7xWGQMs9hNZ24IOY3aYOi8D6+5WtkNRBSttB8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e9a7635a57597d9754eccebdfc7045e6c8600e6b",
+        "rev": "3109eaae18e09d0b8aef23dc2579e7d94b8d4b4e",
         "type": "github"
       },
       "original": {