chore: use better name on nodejs commits

Currently, the name: `npm-robot` is being used in nodejs changelogs as
the atttribution author name for npm-update commits. This makes it so
that entries in the changelog referring to our updates reads like:

```
upgrade npm to 7.18.1 (npm-robot) #39065
```

This change makes it so that the name used in commits is `npm team`,
this way the changelogs entry should read instead as:

```
upgrade npm to 7.18.1 (npm team) #39065
```

Ref: https://nodejs.org/en/blog/release/v16.4.0/

PR-URL: https://github.com/npm/cli/pull/3541
Credit: @ruyadorno
Close: #3541
Reviewed-by: @wraithgar, @targos, @BethGriggs

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