[Snyk] Upgrade typescript from 3.7.3 to 3.9.7

[snyk-bot]

Snyk has created this PR to upgrade typescript from 3.7.3 to 3.9.7.

: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 155 versions ahead of your current version.
• The recommended version was released a month ago, on 2020-07-16.

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[agilgur5]

Snyk has been removed. Closing as unnecessary since this just updated a minor, which wasn't pinned anyway.

Technically every TS minor is breaking though, so we should update soon anyway, but will hold off on that till a breaking release (v0.14.0 has a bit too much in it already, so probably not till v0.15.0). Will also go straight to TS v4 now that that's out. Already writing release notes