Use Nim 2.x commit hash for contractabi

Author: 2-towns

ethers.nimble

@@ -6,7 +6,10 @@ license = "MIT"
 requires "nim >= 1.6.0"
 requires "chronicles >= 0.10.3 & < 0.11.0"
 requires "chronos >= 4.0.0 & < 4.1.0"
-requires "contractabi >= 0.6.0 & < 0.7.0"
+
+# Branch update-to-nim-2-x 
+requires "contractabi#842f48910be4f388bcbf8abf1f02aba1d5e2ee64"
+
 requires "questionable >= 0.10.2 & < 0.11.0"
 requires "json_rpc >= 0.5.0 & < 0.6.0"
 requires "serde >= 1.2.1 & < 1.3.0"