chore: update flake.lock (#1363)

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": 1779414690,
-        "narHash": "sha256-gOTcX/9MZVMUE0Xvb4IEcv+0TQJkZFNEnL757ljU360=",
+        "lastModified": 1779694939,
+        "narHash": "sha256-Ly4j75O8ICaSQx3uxPnwk2x7PMF0XQvn5r0c3yBA7FI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "6dedf69f94d03cbe7bdde106f2d4c23ae2a853bf",
+        "rev": "f9d8b65950353691ab56561e7c73d2e1063d810b",
         "type": "github"
       },
       "original": {