flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/e2587ca' (2026-07-23)
  → 'github:nixos/nixpkgs/624af66' (2026-07-26)
• Updated input 'rixpkgs':
    'github:dwinkler1/rixpkgs/815afc0' (2026-06-27)
  → 'github:dwinkler1/rixpkgs/531e39b' (2026-07-28)

flake.lock

@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1784796856,
-        "narHash": "sha256-wWFrV5/Qbm+lyt5x20E/bSbfJiGKMo4RCxZV8cl/WZI=",
+        "lastModified": 1785090369,
+        "narHash": "sha256-m0pDuRJG7EDo9ri+4Ksu83VsI+PlxNC9lNBfydejce4=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "e2587caef70cea85dd97d7daab492899902dbf5d",
+        "rev": "624af665418d3c65d544145b4d34ad696439570e",
         "type": "github"
       },
       "original": {
@@ -76,11 +76,11 @@
     },
     "rixpkgs": {
       "locked": {
-        "lastModified": 1782576256,
-        "narHash": "sha256-KOvpL9DJJmShb64mX9QTjhxHaxE8MizQIqNUAniuJ2E=",
+        "lastModified": 1785256814,
+        "narHash": "sha256-cXPNTQQX8/5e2w3SsvBL88oSVWX8fzWeQlFnKZMZYtE=",
         "owner": "dwinkler1",
         "repo": "rixpkgs",
-        "rev": "815afc01bc0cc9a2eba80906645bd08f976a4401",
+        "rev": "531e39ba1b6224872fe3f660adb84d67aaa29b22",
         "type": "github"
       },
       "original": {