build(deps-dev): bump @microsoft/microsoft-graph-types (#840)

Bumps [@microsoft/microsoft-graph-types](https://github.com/microsoftgraph/msgraph-typescript-typings) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/microsoftgraph/msgraph-typescript-typings/releases)
- [Commits](microsoftgraph/msgraph-typescript-typings@2.20.0...2.21.0)

---
updated-dependencies:
- dependency-name: "@microsoft/microsoft-graph-types"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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