chore: bump rxjs from 6.5.5 to 6.6.0

Bumps [rxjs](https://github.com/reactivex/rxjs) from 6.5.5 to 6.6.0.
- [Release notes](https://github.com/reactivex/rxjs/releases)
- [Changelog](https://github.com/ReactiveX/rxjs/blob/6.6.0/CHANGELOG.md)
- [Commits](ReactiveX/rxjs@6.5.5...6.6.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -30,7 +30,7 @@
     "@hypertrace/hyperdash": "^1.0.0",
     "core-js": "^3.6.5",
     "lodash": "^4.17.15",
-    "rxjs": "^6.5.5",
+    "rxjs": "^6.6.0",
     "tslib": "^1.0.0",
     "zone.js": "~0.10.3"
   },