Upgrade TypeScript to the 4.9.3

[vovakulikov]

Thanks to @eseliger for starting this. I slightly simplified Erik's PR, it seems that yarn build-ts is passing so should be relatively safe to merge.

Test plan

• Make sure that CI is passing

App preview:

• Web

Check out the client app preview documentation to learn more.

[sg-e2e-regression-test-bob]

Bundle size report 📦

Initial size	Total size	Async size	Modules
0.00% (0.00 kb)	0.00% (0.00 kb)	0.00% (0.00 kb)	0.00% (0)

Look at the Statoscope report for a full comparison between the commits 507def6 and 6dc57e5 or learn more.

Open explanation

• Initial size is the size of the initial bundle (the one that is loaded when you open the page)
• Total size is the size of the initial bundle + all the async loaded chunks
• Async size is the size of all the async loaded chunks
• Modules is the number of modules in the initial bundle