bump nim-web3 for eth_chainId support (#3785)

tersec · zah · commit 3514d39fd243 · 2022-06-29T00:17:41.000+03:00
diff --git a/vendor/nim-web3 b/vendor/nim-web3
@@ -1 +1 @@
-Subproject commit 755b6dc92b1545d6c9eb242c551e8188e35ffe5d
+Subproject commit 7a15892a4e55774524ae0782ccc9e32a541fa841
