deps: upgrade npm to 7.0.2

Refs: https://github.com/npm/cli/blob/latest/CHANGELOG.md#702-2020-10-16

PR-URL: https://github.com/nodejs/node/pull/35667


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>