Bump TypeScript to 4.6 once it's stable

[trivikr]

Is your feature request related to a problem? Please describe.

The AWS SDK for JavaScript (v3) uses TypeScript v4.3.5

aws-sdk-js-v3/package.json

Line 110 in a678025

"typescript": "~4.3.5",

This is because of the issue microsoft/TypeScript#45813, which required us to downgrade TypeScript version to 4.3.x in #2782

Describe the solution you'd like

Bump typescript to 4.6 once stable version is released on February 22nd, 2022.
It will contain the fix from PR microsoft/TypeScript#47070

[github-actions]

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