chore(deps): pin dependency @types/jest to 24.0.19

Author: renovate-bot

sample/01-cats-app/package.json

@@ -33,7 +33,7 @@
     "@nestjs/schematics": "6.7.0",
     "@nestjs/testing": "6.8.4",
     "@types/express": "4.17.1",
-    "@types/jest": "^24.0.19",
+    "@types/jest": "24.0.19",
     "@types/node": "10.14.22",
     "@types/supertest": "2.0.8",
     "jest": "24.9.0",