Update tsconfig.json for es2020 type libraries
Update tsconfig.json for es2020 type libraries

Closes FOO-2784
flag = none

In order to use things like Intl.DateTimeFormat, we need the
ES2020 libraries, since a bunch of stuff is missing in es7's
type definition libs.

Test plan:
* all our TS still compiles

Change-Id: If06d88e46b2e748c360c1f6f6e2657288e8ce914
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/287938
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Aaron Shafovaloff <d0ee6b99167c663aba7bc3efd806fe8d6cad437b@instructure.com>
Reviewed-by: Isaac Moore <258108225390078ef47d1319acab49ad7948abf1@instructure.com>
QA-Review: Charley Kline <05950d7e90ba5e3da323378368c22b3ffaaf6647@instructure.com>
Product-Review: Charley Kline <05950d7e90ba5e3da323378368c22b3ffaaf6647@instructure.com>

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