Update dependency @types/node to v12.20.55 (#12)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[@types/node](https://togithub.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/node)
([source](https://togithub.com/DefinitelyTyped/DefinitelyTyped)) |
[`12.19.4` ->
`12.20.55`](https://renovatebot.com/diffs/npm/@types%2fnode/12.19.4/12.20.55)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@types%2fnode/12.20.55?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@types%2fnode/12.20.55?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@types%2fnode/12.19.4/12.20.55?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@types%2fnode/12.19.4/12.20.55?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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