chore(deps): update nostr-crypto-utils to 0.5.3

Picks up Buffer removal and Uint8Array key support fixes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg

package-lock.json

@@ -30,7 +30,7 @@
         "async-mutex": "^0.5.0",
         "idb": "^8.0.0",
         "json-format-highlight": "^1.0.4",
-        "nostr-crypto-utils": "^0.5.2",
+        "nostr-crypto-utils": "^0.5.3",
         "qrcode": "^1.5.4"
     },
     "devDependencies": {