chore(deps): update typescript-eslint monorepo to v4 (#86)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -51,8 +51,8 @@
   },
   "devDependencies": {
     "@types/node": "^14.0.27",
-    "@typescript-eslint/eslint-plugin": "^3.8.0",
-    "@typescript-eslint/parser": "^3.8.0",
+    "@typescript-eslint/eslint-plugin": "^4.0.0",
+    "@typescript-eslint/parser": "^4.0.0",
     "@wessberg/rollup-plugin-ts": "^1.3.2",
     "c8": "^7.3.0",
     "chai": "^4.2.0",