bump(neon): 7c3839a1 → 6d454c6d (#2783)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.claude-plugin/marketplace.json

@@ -1773,7 +1773,7 @@
         "url": "https://github.com/neondatabase/agent-skills.git",
         "path": "plugins/neon-postgres",
         "ref": "main",
-        "sha": "7c3839a19c3fc9a570cedae7b2495f7f642f9f07"
+        "sha": "6d454c6d36481fffb50dfe46f4b8abb6f2de632f"
       },
       "homepage": "https://github.com/neondatabase/agent-skills/tree/main/plugins/neon-postgres"
     },