chore(deps): bump js-yaml and @microsoft/sp-build-web

Bumps [js-yaml](https://github.com/nodeca/js-yaml) to 4.1.1 and updates ancestor dependency [@microsoft/sp-build-web](http://aka.ms/spfx). These dependencies need to be updated together.


Updates `js-yaml` from 4.1.0 to 4.1.1
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@4.1.0...4.1.1)

Updates `@microsoft/sp-build-web` from 1.21.1 to 1.22.1

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 4.1.1
  dependency-type: indirect
- dependency-name: "@microsoft/sp-build-web"
  dependency-version: 1.22.1
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]