Update tsconfig.json

[mattpocock]

Update tsconfig.json to recommendations in https://www.totaltypescript.com/tsconfig-cheat-sheet

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[joshblack]

Hi there @mattpocock! 👋 Just wanted to say thanks so much for taking the time to make a Pull Request with these changes, we appreciate it a ton!

For the CI failures, most likely it's due to us being on TS v4 still, we have a couple of remaining things to fix for moving to v5 over in: #3824

[joshblack]

Seems like the latest challenge is specifically this error in a couple of spots 👀

 error TS2742: The inferred type of 'default' cannot be named without a reference to '../../node_modules/@primer/octicons-react/dist/icons'.
This is likely not portable. A type annotation is necessary.

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