fix: remove RxJS peer dependency (#335)

Closes #333

Author: shaman-apprentice

projects/testing-library/package.json

@@ -32,8 +32,7 @@
     "@angular/common": ">= 14.0.0",
     "@angular/platform-browser": ">= 14.0.0",
     "@angular/router": ">= 14.0.0",
-    "@angular/core": ">= 14.0.0",
-    "rxjs": ">= 7.4.0"
+    "@angular/core": ">= 14.0.0"
   },
   "dependencies": {
     "@testing-library/dom": "^8.0.0",