chore(): drop old peer deps

Author: kamilmysliwiec

package.json

@@ -48,8 +48,8 @@
     "typescript": "4.7.4"
   },
   "peerDependencies": {
-    "@nestjs/common": "^6.0.0 || ^7.0.0 || ^8.0.0 || ^9.0.0",
-    "@nestjs/core": "^6.0.0 || ^7.0.0 || ^8.0.0 || ^9.0.0",
+    "@nestjs/common": "^8.0.0 || ^9.0.0",
+    "@nestjs/core": "^8.0.0 || ^9.0.0",
     "mongoose": "^6.0.2",
     "reflect-metadata": "^0.1.12",
     "rxjs": "^7.0.0"