chore: replace deprecated mumbai with amoy (#168)

* feat: replace deprecated mumbai with amoy

* fix: amoy etherscan config

---------

Co-authored-by: tngzixiang <tng_zi_xiang@tech.gov.sg>
Co-authored-by: Seth <hullogh@gmail.com>

foundry.toml

@@ -22,7 +22,7 @@
   mainnet = { key = "${API_KEY_ETHERSCAN}" }
   optimism = { key = "${API_KEY_OPTIMISTIC_ETHERSCAN}" }
   polygon = { key = "${API_KEY_POLYGONSCAN}" }
-  mumbai = { key = "${API_KEY_POLYGONSCAN}" }
+  amoy = { key = "${API_KEY_POLYGONSCAN}", url = "https://api-amoy.polygonscan.com/api", chain = "80002" }
   sepolia = { key = "${API_KEY_ETHERSCAN}" }
 
 [rpc_endpoints]
@@ -31,7 +31,7 @@
   mainnet = "https://mainnet.infura.io/v3/${API_KEY_INFURA}"
   optimism = "https://optimism-mainnet.infura.io/v3/${API_KEY_INFURA}"
   polygon = "https://polygon-mainnet.infura.io/v3/${API_KEY_INFURA}"
-  mumbai = "https://polygon-mumbai.infura.io/v3/${API_KEY_INFURA}"
+  amoy = "https://polygon-amoy.infura.io/v3/${API_KEY_INFURA}"
   sepolia = "https://sepolia.infura.io/v3/${API_KEY_INFURA}"
 
 [fmt]