fix: RxJS now supports tslib 2.x, rather than just 2.1.x (#6692)

resolves #6689

Author: benlesh

package-lock.json

@@ -140,7 +140,7 @@
   },
   "homepage": "https://rxjs.dev",
   "dependencies": {
-    "tslib": "~2.1.0"
+    "tslib": "^2.1.0"
   },
   "devDependencies": {
     "@angular-devkit/build-optimizer": "0.4.6",