docs(specs): update debug server endpoints from Daikon (#871)

Author: alchemy-bot

src/openrpc/alchemy/debug/debug.yaml

@@ -70,6 +70,8 @@ servers:
     name: Polynomial Mainnet
   - url: https://polynomial-sepolia.g.alchemy.com/v2
     name: Polynomial Sepolia
+  - url: https://stable-mainnet.g.alchemy.com/v2
+    name: Stable Mainnet
   - url: https://stable-testnet.g.alchemy.com/v2
     name: Stable Testnet
   - url: https://worldchain-mainnet.g.alchemy.com/v2