chore(deps): update dependency @types/jest to v26.0.21

Author: renovate-bot

package-lock.json

@@ -28,7 +28,7 @@
     "reflect-metadata": "0.1.13",
     "@nestjs/core": "7.6.14",
     "@nestjs/testing": "7.6.14",
-    "@types/jest": "26.0.20",
+    "@types/jest": "26.0.21",
     "@typescript-eslint/eslint-plugin": "4.18.0",
     "@typescript-eslint/parser": "4.18.0",
     "eslint": "7.22.0",