flake.lock: Update

Flake lock file updates:

```
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/78add7b7abb61689e34fc23070a8f55e1d26185b' (2025-05-28)
  → 'github:nixos/nixpkgs/ed29f002b6d6e5e7e32590deb065c34a31dc3e91' (2025-06-06)
• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/910796cabe436259a29a72e8d3f5e180fc6dfacc' (2025-05-31)
  → 'github:nixos/nixpkgs/3e3afe5174c561dee0df6f2c2b2236990146329f' (2025-06-07)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/1f3f7b784643d488ba4bf315638b2b0a4c5fb007' (2025-05-26)
  → 'github:numtide/treefmt-nix/a05be418a1af1198ca0f63facb13c985db4cb3c5' (2025-06-06)
```

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1748421225,
-        "narHash": "sha256-XXILOc80tvlvEQgYpYFnze8MkQQmp3eQxFbTzb3m/R0=",
+        "lastModified": 1749173751,
+        "narHash": "sha256-ENY3y3v6S9ZmLDDLI3LUT8MXmfXg/fSt2eA4GCnMVCE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "78add7b7abb61689e34fc23070a8f55e1d26185b",
+        "rev": "ed29f002b6d6e5e7e32590deb065c34a31dc3e91",
         "type": "github"
       },
       "original": {
@@ -36,11 +36,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1748693115,
-        "narHash": "sha256-StSrWhklmDuXT93yc3GrTlb0cKSS0agTAxMGjLKAsY8=",
+        "lastModified": 1749285348,
+        "narHash": "sha256-frdhQvPbmDYaScPFiCnfdh3B/Vh81Uuoo0w5TkWmmjU=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "910796cabe436259a29a72e8d3f5e180fc6dfacc",
+        "rev": "3e3afe5174c561dee0df6f2c2b2236990146329f",
         "type": "github"
       },
       "original": {
@@ -95,11 +95,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1748243702,
-        "narHash": "sha256-9YzfeN8CB6SzNPyPm2XjRRqSixDopTapaRsnTpXUEY8=",
+        "lastModified": 1749194973,
+        "narHash": "sha256-eEy8cuS0mZ2j/r/FE0/LYBSBcIs/MKOIVakwHVuqTfk=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "1f3f7b784643d488ba4bf315638b2b0a4c5fb007",
+        "rev": "a05be418a1af1198ca0f63facb13c985db4cb3c5",
         "type": "github"
       },
       "original": {