Bump rxjs from 7.0.0-beta.11 to 7.0.0-beta.12

Bumps [rxjs](https://github.com/reactivex/rxjs) from 7.0.0-beta.11 to 7.0.0-beta.12.
- [Release notes](https://github.com/reactivex/rxjs/releases)
- [Changelog](https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md)
- [Commits](ReactiveX/rxjs@7.0.0-beta.11...7.0.0-beta.12)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -39,7 +39,7 @@
     "fuzzaldrin-plus": "^0.6.0",
     "lunr": "^2.3.9",
     "lunr-languages": "^1.4.0",
-    "rxjs": "^7.0.0-beta.10"
+    "rxjs": "^7.0.0-beta.12"
   },
   "devDependencies": {
     "@fortawesome/fontawesome-free": "^5.15.2",