chore(deps): update dependency @types/mongoose to v5.5.20

Author: renovate-bot

sample/06-mongoose/package-lock.json

@@ -29,7 +29,7 @@
     "rxjs": "6.5.3"
   },
   "devDependencies": {
-    "@types/mongoose": "5.5.19",
+    "@types/mongoose": "5.5.20",
     "@nestjs/cli": "6.10.1",
     "@nestjs/schematics": "6.7.0",
     "@nestjs/testing": "6.8.2",

sample/06-mongoose/package.json

@@ -28,7 +28,7 @@
     "rxjs": "6.5.3"
   },
   "devDependencies": {
-    "@types/mongoose": "5.5.19",
+    "@types/mongoose": "5.5.20",
     "@nestjs/cli": "6.10.1",
     "@nestjs/schematics": "6.7.0",
     "@nestjs/testing": "6.8.3",