Upgrade typescript to 3.9

[wschurman]

Why

Release notes: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-9.html#breaking-changes

For this project, the changes that affect us are:

• speed improvements
• Type Parameters That Extend any No Longer Act as any

How

Upgrade in package.json

Test Plan

yarn test
yarn integration
yarn typedoc (depends on typescript)

[codecov]

Codecov Report

Merging #18 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   88.48%   88.48%           
=======================================
  Files          63       63           
  Lines        1138     1138           
  Branches       97       97           
=======================================
  Hits         1007     1007           
  Misses         62       62           
  Partials       69       69           

Flag	Coverage Δ
#integration	88.48% <ø> (ø)
#unittest	88.48% <ø> (ø)

Impacted Files	Coverage Δ
...-adapter-knex/src/PostgresEntityDatabaseAdapter.ts	78.78% <ø> (ø)

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[jkhales]

💪