Bump async in /educator-guides/lab-guides/virtual-iot-lab/code/server

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 2.6.4. - [Release notes](https://github.com/caolan/async/releases) - [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md) - [Commits](https://github.com/caolan/async/compare/v2.6.3...v2.6.4) --- updated-dependencies: - dependency-name: async dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com>
2022-04-29 15:22:27 +00:00 · 2022-04-29 15:22:27 +00:00 · 73760b9fb8
--- a/educator-guides/lab-guides/virtual-iot-lab/code/server/package-lock.json
+++ b/educator-guides/lab-guides/virtual-iot-lab/code/server/package-lock.json