chore(deps): update actions/setup-node action to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
actions/setup-node	action	major	v2	source

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Release Notes

actions/setup-node

v2

Compare Source

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Configuration

📅 Schedule: "on the 1st through 7th day of the month" in timezone America/Los_Angeles.

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

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🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[codecov]

Codecov Report

Merging #411 (e35a75f) into master (73f4129) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #411   +/-   ##
=======================================
  Coverage   85.91%   85.91%           
=======================================
  Files          14       14           
  Lines         653      653           
  Branches      175      175           
=======================================
  Hits          561      561           
  Misses         92       92           

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