chore: update rxjs to v7

Author: L-X-T

docs/dependencies.html

@@ -139,7 +139,7 @@
         <li>
             <b>jsrsasign</b> : ^11.1.3</li>
         <li>
-            <b>rxjs</b> : ^6.6.7</li>
+            <b>rxjs</b> : ^7.8.2</li>
         <li>
             <b>tslib</b> : ^2.5.2</li>
         <li>

docs/js/search/search_index.js

@@ -36,7 +36,7 @@
     "angular-oauth2-oidc": "^22.0.0",
     "bootstrap": "^3.4.1",
     "jsrsasign": "^11.1.3",
-    "rxjs": "^6.6.7",
+    "rxjs": "^7.8.2",
     "tslib": "^2.5.2",
     "zone.js": "~0.16.2"
   },