flake.lock: Update

Flake lock file updates:

```
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/11415c7ae8539d6292f2928317ee7a8410b28bb9' (2025-02-21)
  → 'github:nixos/nixpkgs/6af28b834daca767a7ef99f8a7defa957d0ade6f' (2025-03-04)
• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/73cf49b8ad837ade2de76f87eb53fc85ed5d4680' (2025-02-18)
  → 'github:nixos/nixpkgs/ba487dbc9d04e0634c64e3b1f0d25839a0a68246' (2025-03-03)
```

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1741332913,
-        "narHash": "sha256-ri1e8ZliWS3Jnp9yqpKApHaOo7KBN33W8ECAKA4teAQ=",
+        "lastModified": 1741048562,
+        "narHash": "sha256-W4YZ3fvWZiFYYyd900kh8P8wU6DHSiwaH0j4+fai1Sk=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "20755fa05115c84be00b04690630cb38f0a203ad",
+        "rev": "6af28b834daca767a7ef99f8a7defa957d0ade6f",
         "type": "github"
       },
       "original": {
@@ -36,11 +36,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1741379970,
-        "narHash": "sha256-Wh7esNh7G24qYleLvgOSY/7HlDUzWaL/n4qzlBePpiw=",
+        "lastModified": 1741010256,
+        "narHash": "sha256-WZNlK/KX7Sni0RyqLSqLPbK8k08Kq7H7RijPJbq9KHM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "36fd87baa9083f34f7f5027900b62ee6d09b1f2f",
+        "rev": "ba487dbc9d04e0634c64e3b1f0d25839a0a68246",
         "type": "github"
       },
       "original": {