Update dependency eslint to v7

Author: renovate-bot

package.json

@@ -33,7 +33,7 @@
     "@typescript-eslint/eslint-plugin": "2.34.0",
     "@typescript-eslint/parser": "2.34.0",
     "cpx": "1.5.0",
-    "eslint": "6.8.0",
+    "eslint": "7.32.0",
     "eslint-config-prettier": "6.15.0",
     "eslint-plugin-prettier": "3.4.1",
     "gas-webpack-plugin": "1.2.3",