Update TypeScript to version 4.6.2
and work-around stricter type checks
#14640
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I'm guessing that we're now running into the class-related improvements mentioned in https://devblogs.microsoft.com/typescript/announcing-typescript-4-6/#target-es2022
To unblock this update, and any future ones, this patch simply tweaks the JSDocs to get
gulp typestest
to run without errors.