feat: Add support for Polygon Amoy testnet, remove Polygon Mumbai (#540)

* Add support for Polygon Amoy in StdChains.sol

* Add support for Polygon Amoy in StdChains.t.sol

* chore: remove mumbai, since its based on goerli which is deprecated

---------

Co-authored-by: Matt Solomon <[email protected]>

Author: kcyeu

src/StdChains.sol

@@ -214,7 +214,7 @@ abstract contract StdChains {
         setChainWithDefaultRpcUrl("arbitrum_nova", ChainData("Arbitrum Nova", 42170, "https://nova.arbitrum.io/rpc"));
         setChainWithDefaultRpcUrl("polygon", ChainData("Polygon", 137, "https://polygon-rpc.com"));
         setChainWithDefaultRpcUrl(
-            "polygon_mumbai", ChainData("Polygon Mumbai", 80001, "https://rpc-mumbai.maticvigil.com")
+            "polygon_amoy", ChainData("Polygon Amoy", 80002, "https://rpc-amoy.polygon.technology")
         );
         setChainWithDefaultRpcUrl("avalanche", ChainData("Avalanche", 43114, "https://api.avax.network/ext/bc/C/rpc"));
         setChainWithDefaultRpcUrl(

test/StdChains.t.sol

@@ -62,7 +62,7 @@ contract StdChainsTest is Test {
     //     _testRpc("arbitrum_one_sepolia");
     //     _testRpc("arbitrum_nova");
     //     _testRpc("polygon");
-    //     _testRpc("polygon_mumbai");
+    //     _testRpc("polygon_amoy");
     //     _testRpc("avalanche");
     //     _testRpc("avalanche_fuji");
     //     _testRpc("bnb_smart_chain");