Bump yarn from 1.22.19 to 1.22.21

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]>

package.json

@@ -21,7 +21,7 @@
     "lit": "^3.1.0",
     "ts-auto-mock": "3.5.0",
     "ttypescript": "^1.5.13",
-    "yarn": "^1.22.18"
+    "yarn": "^1.22.21"
   },
   "devDependencies": {
     "@babel/core": "^7.23.5",