fix(deps): update dependency rxjs to v7

Author: renovate-bot

package-lock.json

@@ -44,7 +44,7 @@
     "@angular/router": "11.2.8",
     "@types/lodash": "4.14.168",
     "lodash": "4.17.21",
-    "rxjs": "6.6.7",
+    "rxjs": "7.4.0",
     "tslib": "2.1.0",
     "zone.js": "0.11.4"
   },