[Snyk] Upgrade typescript from 3.7.2 to 3.9.2

[snyk-bot]

Snyk has created this PR to upgrade typescript from 3.7.2 to 3.9.2.

✨What is Merge Advice?

We check thousands of dependency upgrade pull requests and CI tests every day to see which upgrades were successfully merged. After crunching this data, we give a recommendation on how safe we think the change is for you to merge without causing issues. Learn more, and share your feedback to help improve this feature. 🙏

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 153 versions ahead of your current version.
• The recommended version was released 21 days ago, on 2020-05-12.

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