chore: update downlevel-dts config to target TS4.2

[bradzacher]

Overview

In #5915 we bumped our minimum supported TS version to 4.2.
This applies to both users of our packages and consumer dependents.
As such we no longer need to downlevel all the way to TS3.4 any more.

This PR updates our downlevel-dts calls to target TS4.2 and updates the folder naming and targets to match

[typescript-eslint]

Thanks for the PR, @bradzacher!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 47 targets

• Node 14 - nx test eslint-plugin --coverage=false
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