[chore] flake.lock: update inputs

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d51c28603def282a24fa034bcb007e2bcb5b5dd0' (2024-10-09)
  → 'github:NixOS/nixpkgs/a3f9ad65a0bf298ed5847629a57808b97e6e8077' (2024-10-12)
• Updated input 'nixvim':
    'github:nix-community/nixvim/5cd8c9cf3104027b42ffe531fb68463ecb08ebc9' (2024-10-10)
  → 'github:nix-community/nixvim/619e24366e8ad34230d65a323d26ca981bfa6927' (2024-10-13)

flake.lock

@@ -260,11 +260,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1728627514,
+        "lastModified": 1728740863,
-        "narHash": "sha256-r+SF9AnHrTg+bk6YszoKfV9lgyw+yaFUQe0dOjI0Z2o=",
+        "narHash": "sha256-u+rxA79a0lyhG+u+oPBRtTDtzz8kvkc9a6SWSt9ekVc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c505ebf777526041d792a49d5f6dd4095ea391a7",
+        "rev": "a3f9ad65a0bf298ed5847629a57808b97e6e8077",
         "type": "github"
       },
       "original": {
@@ -292,11 +292,11 @@
         "treefmt-nix": "treefmt-nix"
       },
       "locked": {
-        "lastModified": 1728736326,
+        "lastModified": 1728829992,
-        "narHash": "sha256-JYy050VI7AQyDPHjZ/48rdNFfVvdbR0wPtsRA/4nc7E=",
+        "narHash": "sha256-722PdOQ4uTTAOyS3Ze4H7LXDNVi9FecKbLEvj3Qu0hM=",
         "owner": "nix-community",
         "repo": "nixvim",
-        "rev": "2e1b3b7d43f485866573f70411a4797ce38e27bb",
+        "rev": "619e24366e8ad34230d65a323d26ca981bfa6927",
         "type": "github"
       },
       "original": {