chore(deps): update dependency rxjs to v6.6.7

Author: renovate-bot

package-lock.json

@@ -42,7 +42,7 @@
     "prettier": "2.2.1",
     "reflect-metadata": "0.1.13",
     "release-it": "14.5.0",
-    "rxjs": "6.6.6",
+    "rxjs": "6.6.7",
     "rxjs-compat": "6.6.6",
     "supertest": "6.1.3",
     "ts-jest": "26.5.4",