flake.lock: Update dsh-nu

dsh-nu 0.3.3 -> 0.4.0; the input now resolves to the merged AST-preflight release.

Assisted-by: DeepSeek Harness (deepseek-flash)

flake.lock

@@ -174,11 +174,11 @@
         "nur-ryan4yin": "nur-ryan4yin"
       },
       "locked": {
-        "lastModified": 1792343443,
-        "narHash": "sha256-5QpExZfeHrb3/crshRpJTdnpu4GdCmPK9YJvWXunzbI=",
+        "lastModified": 1792377933,
+        "narHash": "sha256-xDPXjJG0NdCMNHkp/KZFZ3E7n9Vuu+MBmDi9uIbj+NY=",
         "owner": "ryan4yin",
         "repo": "dsh-nu",
-        "rev": "a7af102bf3ef942e09182c10cfee6a8951eed02d",
+        "rev": "47c813c8bd477ae4911a89bd6bd647da057856d1",
         "type": "github"
       },
       "original": {