build: Upgrade to TypeScript 4.5

[SimonAlling]

This will enable upgrading to Jest 29, which requires TypeScript 4.5 if jest-environment-jsdom is used.

I did this:

npm install --save-dev --save-exact typescript@4.5

Then I got this warning when running npm run lint:

WARNING: You are currently running a version of TypeScript which is not officially supported by @typescript-eslint/typescript-estree.

You may find that it works just fine, or you may not.

SUPPORTED TYPESCRIPT VERSIONS: >=3.3.1 <4.5.0

YOUR TYPESCRIPT VERSION: 4.5.5

Please only submit bug reports when using the officially supported version.

So I did this:

npm install --save-dev @typescript-eslint/eslint-plugin@^4

It didn't help, so I did this:

npm install --save-dev @typescript-eslint/eslint-plugin@^5 @typescript-eslint/parser@^5

Breaking?

See #145 for details on why this should possibly be considered a breaking change.

I consider it backward compatible, because I don't think any consumer is broken by it. Notably, building with and without this PR in different Git working trees and using git diff --no-index to diff the emitted code (build/ and lib/) reveals that it is exactly identical.