Update typescript-eslint monorepo to v2.26.0

Author: renovate-bot

package-lock.json

@@ -24,8 +24,8 @@
         "@babel/preset-typescript": "7.9.0",
         "@types/jest": "25.1.4",
         "@types/node": "12.12.21",
-        "@typescript-eslint/eslint-plugin": "2.12.0",
-        "@typescript-eslint/parser": "2.12.0",
+        "@typescript-eslint/eslint-plugin": "2.26.0",
+        "@typescript-eslint/parser": "2.26.0",
         "babel-jest": "25.2.6",
         "eslint": "6.8.0",
         "eslint-config-prettier": "6.10.1",