chore(deps-dev): bump @types/node (#9852)

Bumps the dev-dependencies group in /apps/slack/lambda with 1 update: [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node).


Updates `@types/node` from 22.15.19 to 22.15.21
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-version: 22.15.21
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
...

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

Author: dependabot[bot]

apps/slack/lambda/package-lock.json

@@ -29,7 +29,7 @@
     "@types/cors": "^2.8.18",
     "@types/express": "^4.17.21",
     "@types/mocha": "^10.0.10",
-    "@types/node": "^22.15.19",
+    "@types/node": "^22.15.21",
     "@types/sinon": "^10.0.16",
     "@typescript-eslint/eslint-plugin": "^5.62.0",
     "chai": "^4.5.0",