fix(deps): update dependency rxjs to v7

package.json

@@ -66,7 +66,7 @@
     "@sourcegraph/extension-api-classes": "^1.1.0",
     "@types/sinon": "10.0.4",
     "graphql": "^15.4.0",
-    "rxjs": "^6.5.1",
+    "rxjs": "^7.5.1",
     "sinon": "^10.0.0",
     "sourcegraph": "^25.4.0"
   }

yarn.lock

@@ -6135,12 +6135,12 @@ rxjs-report-usage@^1.0.4:
     glob "~7.1.6"
     prompts "~2.3.2"
 
-rxjs@^6.5.1:
-  version "6.5.5"
-  resolved "https://registry.npmjs.org/rxjs/-/rxjs-6.5.5.tgz#c5c884e3094c8cfee31bf27eb87e54ccfc87f9ec"
-  integrity sha512-WfQI+1gohdf0Dai/Bbmk5L5ItH5tYqm3ki2c5GdWhKjalzjg93N3avFjVStyZZz+A2Em+ZxKH5bNghw9UeylGQ==
+rxjs@^7.5.1:
+  version "7.5.1"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-7.5.1.tgz#af73df343cbcab37628197f43ea0c8256f54b157"
+  integrity sha512-KExVEeZWxMZnZhUZtsJcFwz8IvPvgu4G2Z2QyqjZQzUGr32KDYuSxrEYO4w3tFFNbfLozcrKUTvTPi+E9ywJkQ==
   dependencies:
-    tslib "^1.9.0"
+    tslib "^2.1.0"
 
 safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.2"
@@ -6891,12 +6891,12 @@ tsconfig-paths@^3.9.0:
     minimist "^1.2.0"
     strip-bom "^3.0.0"
 
-tslib@^1.8.1, tslib@^1.9.0:
+tslib@^1.8.1:
   version "1.11.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.11.1.tgz#eb15d128827fbee2841549e171f45ed338ac7e35"
   integrity sha512-aZW88SY8kQbU7gpV19lN24LtXh/yD4ZZg6qieAJDDg+YBsJcSmLGK9QpnUjAKVG/xefmvJGd1WUmfpT/g6AJGA==
 
-tslib@^2.0.0:
+tslib@^2.0.0, tslib@^2.1.0:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.3.1.tgz#e8a335add5ceae51aa261d32a490158ef042ef01"
   integrity sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw==