fix(core): chainId 31337 corresponds to Anvil/Hardhat not Dev

fixes: https://github.com/foundry-rs/foundry/issues/1866, because
previously we'd read chain id 31337, parse it as Dev, and then when
convert it to the wrong number (1337) which would make the transaction's
chain id not match the signer's

ethers-core/src/types/chain.rs

@@ -126,7 +126,7 @@ impl TryFrom<u64> for Chain {
             100 => Chain::XDai,
             137 => Chain::Polygon,
             1337 => Chain::Dev,
-            31337 => Chain::Dev,
+            31337 => Chain::AnvilHardhat,
             250 => Chain::Fantom,
             4002 => Chain::FantomTestnet,
             80001 => Chain::PolygonMumbai,