fix(deps): update dependency rxjs to v7

Author: renovate-bot

package-lock.json

@@ -97,7 +97,7 @@
     "postcss-url": "10.1.3",
     "reqlim": "0.0.0",
     "rucksack-css": "1.0.2",
-    "rxjs": "6.6.7",
+    "rxjs": "7.4.0",
     "snyk": "1.759.0",
     "wavesurfer.js": "4.6.0",
     "worker-loader": "3.0.8"