Build(deps-dev): Bump qunit in /app/assets/javascripts (#23645)

Bumps [qunit](https://github.com/qunitjs/qunit) from 2.19.4 to 2.20.0.
- [Release notes](https://github.com/qunitjs/qunit/releases)
- [Changelog](https://github.com/qunitjs/qunit/blob/main/History.md)
- [Commits](https://github.com/qunitjs/qunit/compare/2.19.4...2.20.0)

---
updated-dependencies:
- dependency-name: qunit
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

@@ -94,7 +94,7 @@
     "message-bus-client": "^4.3.8",
     "messageformat": "0.1.5",
     "pretender": "^3.4.7",
-    "qunit": "^2.19.4",
+    "qunit": "^2.20.0",
     "qunit-dom": "^2.0.0",
     "sass": "^1.66.1",
     "select-kit": "1.0.0",

app/assets/javascripts/yarn.lock

@@ -9025,10 +9025,10 @@ qunit-dom@^2.0.0:
     ember-cli-babel "^7.23.0"
     ember-cli-version-checker "^5.1.1"
 
-qunit@^2.19.4:
-  version "2.19.4"
-  resolved "https://registry.yarnpkg.com/qunit/-/qunit-2.19.4.tgz#2d689bb1165edd4b812e3ed2ee06ff907e9f2ece"
-  integrity sha512-aqUzzUeCqlleWYKlpgfdHHw9C6KxkB9H3wNfiBg5yHqQMzy0xw/pbCRHYFkjl8MsP/t8qkTQE+JTYL71azgiew==
+qunit@^2.20.0:
+  version "2.20.0"
+  resolved "https://registry.yarnpkg.com/qunit/-/qunit-2.20.0.tgz#66a404a0142781316bbda91535869ce5671555b1"
+  integrity sha512-N8Fp1J55waE+QG1KwX2LOyqulZUToRrrPBqDOfYfuAMkEglFL15uwvmH1P4Tq/omQ/mGbBI8PEB3PhIfvUb+jg==
   dependencies:
     commander "7.2.0"
     node-watch "0.7.3"