fix(catalog): carry the Knots pin into app-catalog/catalog.json — drift gate

The signed release catalog was pinned in 6c41852c; the curation source still
said :latest, which ec8d88a6 established can stall the fleet.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app-catalog/catalog.json

@@ -19,7 +19,7 @@
       "author": "Bitcoin Knots",
       "category": "money",
       "tier": "core",
-      "dockerImage": "source.archipelago-foundation.org/lfg2025/bitcoin-knots:latest",
+      "dockerImage": "source.archipelago-foundation.org/lfg2025/bitcoin-knots:29.3.knots20260210",
       "repoUrl": "https://github.com/bitcoinknots/bitcoin"
     },
     {