Update dependency ethers to v5.6.8

Author: renovate-bot

package.json

@@ -34,7 +34,7 @@
 		"eslint-config-xo": "0.41.0",
 		"eslint-config-xo-typescript": "0.51.1",
 		"ethereum-waffle": "3.4.4",
-		"ethers": "5.6.1",
+		"ethers": "5.6.8",
 		"fast-deep-equal": "3.1.3",
 		"hardhat": "2.9.8",
 		"husky": "7.0.4",