Build(deps-dev): Bump message-bus-client from 4.3.7 to 4.3.8 in /app/assets/javascripts (#23091)

Bumps [message-bus-client](https://github.com/discourse/message_bus) from 4.3.7 to 4.3.8.
- [Changelog](https://github.com/discourse/message_bus/blob/main/CHANGELOG)
- [Commits](https://github.com/discourse/message_bus/compare/v4.3.7...v4.3.8)

---
updated-dependencies:
- dependency-name: message-bus-client
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

app/assets/javascripts/discourse/package.json

@@ -87,7 +87,7 @@
     "js-yaml": "^4.1.0",
     "jsdom": "^22.1.0",
     "loader.js": "^4.7.0",
-    "message-bus-client": "^4.3.7",
+    "message-bus-client": "^4.3.8",
     "messageformat": "0.1.5",
     "pretender": "^3.4.7",
     "qunit": "^2.19.4",

app/assets/javascripts/yarn.lock

@@ -7019,10 +7019,10 @@ merge2@^1.2.3, merge2@^1.3.0:
   resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.4.1.tgz#4368892f885e907455a6fd7dc55c0c9d404990ae"
   integrity sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg==
 
-message-bus-client@^4.3.7:
-  version "4.3.7"
-  resolved "https://registry.yarnpkg.com/message-bus-client/-/message-bus-client-4.3.7.tgz#c06c6d0228235571c7addcdfa6065ed8c42b125e"
-  integrity sha512-lpdZWexPtU1chEgW5XxbxK/Ra/r8o1zfPxE76dSAO9DkK7i5lQhUTFdFGHy7CdSX747GqTa8dBk51SJZlWU+vQ==
+message-bus-client@^4.3.8:
+  version "4.3.8"
+  resolved "https://registry.yarnpkg.com/message-bus-client/-/message-bus-client-4.3.8.tgz#5ee23c03236b250b13613034764a87881c350d4e"
+  integrity sha512-Vvrs0tOx5YcKeEoh7l1zATLVKt49FK34Vq/sloRbgDDQUB6VAbSVJPvH8RVxQ/PZGb9ScGzCMJCMnDyVa2p8CQ==
 
 messageformat@0.1.5:
   version "0.1.5"