chore(deps): update dependency @types/jest to v26

Author: renovate-bot

package-lock.json

@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "@types/aws-lambda": "8.10.46",
-    "@types/jest": "25.1.3",
+    "@types/jest": "26.0.24",
     "@types/node": "13.7.4",
     "jest": "25.1.0",
     "prettier": "1.19.1",