Bump ws from 6.2.1 to 6.2.4 in /example

Bumps [ws](https://github.com/websockets/ws) from 6.2.1 to 6.2.4.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@6.2.1...6.2.4)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 6.2.4
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

example/yarn.lock

@@ -9201,7 +9201,7 @@ raw-body@2.4.0:
     unpipe "1.0.0"
 
 "react-activity-feed@link:..":
-  version "1.3.4"
+  version "1.4.0"
   dependencies:
     "@babel/runtime" "^7.14.0"
     "@types/emoji-mart" "^3.0.4"
@@ -11700,16 +11700,16 @@ write-file-atomic@^3.0.0:
     typedarray-to-buffer "^3.1.5"
 
 ws@^6.2.1:
-  version "6.2.1"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-6.2.1.tgz#442fdf0a47ed64f59b6a5d8ff130f4748ed524fb"
-  integrity sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==
+  version "6.2.4"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-6.2.4.tgz#d80bd7adbe495d8f4ff55d3a23a274740fcfc903"
+  integrity sha512-PNIUUyLI5YpkJZj60YBzX1o0ByQ4ovvfmq9N/Kig/PAYbVlGyz4R6G0SEWrD0O9acc0sT2+IdMBVLFv8FSi0Nw==
   dependencies:
     async-limiter "~1.0.0"
 
 ws@^7.4.4:
-  version "7.4.5"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-7.4.5.tgz#a484dd851e9beb6fdb420027e3885e8ce48986c1"
-  integrity sha512-xzyu3hFvomRfXKH8vOFMU3OguG6oOvhXMo3xsGy3xWExqaM2dxBbVxuD99O7m3ZUFMvvscsZDqxfgMaRr/Nr1g==
+  version "7.5.11"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-7.5.11.tgz#9460daf1812bb81a423c5b9eac746941a86310fa"
+  integrity sha512-zS54Oen9bITtp7kp2XM3AydrCIq1D+HwJOuH+c+e4LfpL/lotP5osijd+UoMnxwAam1GN8R4KtLAyIrIcBNpiA==
 
 xml-name-validator@^3.0.0:
   version "3.0.0"