flake.lock: Update

Flake lock file updates:

```
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/11415c7ae8539d6292f2928317ee7a8410b28bb9' (2025-02-21)
  → 'github:nixos/nixpkgs/1546c45c538633ae40b93e2d14e0bb6fd8f13347' (2025-03-02)
• 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": 1740743217,
-        "narHash": "sha256-brsCRzLqimpyhORma84c3W2xPbIidZlIc3JGIuQVSNI=",
+        "lastModified": 1740932899,
+        "narHash": "sha256-F0qDu2egq18M3edJwEOAE+D+VQ+yESK6YWPRQBfOqq8=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b27ba4eb322d9d2bf2dc9ada9fd59442f50c8d7c",
+        "rev": "1546c45c538633ae40b93e2d14e0bb6fd8f13347",
         "type": "github"
       },
       "original": {
@@ -36,11 +36,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1740695751,
-        "narHash": "sha256-D+R+kFxy1KsheiIzkkx/6L63wEHBYX21OIwlFV8JvDs=",
+        "lastModified": 1741010256,
+        "narHash": "sha256-WZNlK/KX7Sni0RyqLSqLPbK8k08Kq7H7RijPJbq9KHM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "6313551cd05425cd5b3e63fe47dbc324eabb15e4",
+        "rev": "ba487dbc9d04e0634c64e3b1f0d25839a0a68246",
         "type": "github"
       },
       "original": {