build(deps): bump yarn from 1.22.19 to 1.22.21 in /demos/moderator

Bumps [yarn](https://github.com/yarnpkg/yarn) from 1.22.19 to 1.22.21.
- [Release notes](https://github.com/yarnpkg/yarn/releases)
- [Changelog](https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md)
- [Commits](yarnpkg/yarn@v1.22.19...v1.22.21)

---
updated-dependencies:
- dependency-name: yarn
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

demos/moderator/package.json

@@ -23,7 +23,7 @@
     "preact": "10.19.2",
     "snyk": "^1.1245.0",
     "whatwg-fetch": "3.6.19",
-    "yarn": "^1.22.19"
+    "yarn": "^1.22.21"
   },
   "devDependencies": {
     "autoprefixer": "9.8.8",

demos/moderator/yarn.lock

@@ -13374,10 +13374,10 @@ yargs@^17.2.1, yargs@^17.3.1:
     y18n "^5.0.5"
     yargs-parser "^21.1.1"
 
-yarn@^1.22.19:
-  version "1.22.19"
-  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.22.19.tgz#4ba7fc5c6e704fce2066ecbfb0b0d8976fe62447"
-  integrity sha512-/0V5q0WbslqnwP91tirOvldvYISzaqhClxzyUKXYxs07yUILIs5jx/k6CFe8bvKSkds5w+eiOqta39Wk3WxdcQ==
+yarn@^1.22.21:
+  version "1.22.21"
+  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.22.21.tgz#1959a18351b811cdeedbd484a8f86c3cc3bbaf72"
+  integrity sha512-ynXaJsADJ9JiZ84zU25XkPGOvVMmZ5b7tmTSpKURYwgELdjucAOydqIOrOfTxVYcNXe91xvLZwcRh68SR3liCg==
 
 yocto-queue@^0.1.0:
   version "0.1.0"