Bump @types/async from 3.2.21 to 3.2.22 in /src/generator (#786)

Bumps [@types/async](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/async) from 3.2.21 to 3.2.22.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/async)

---
updated-dependencies:
- dependency-name: "@types/async"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

src/generator/package.json

@@ -27,7 +27,7 @@
     "@autorest/core": "3.9.7",
     "@autorest/modelerfour": "^4.26.2",
     "@ts-common/commonmark-to-markdown": "^2.0.0",
-    "@types/async": "^3.2.21",
+    "@types/async": "^3.2.22",
     "@types/js-yaml": "^4.0.7",
     "@types/node": "^20.8.6",
     "@types/yargs": "^17.0.28",