update cgroup-metrics to get rid of codecov as production dependency, fix codecov in build

[alexkli]

Description

• bring in codecov should be a devDependency node-cgroup-metrics#22
• make codecov work

Only merge after #26 to get automatic release in.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@ed15755). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #25   +/-   ##
=========================================
  Coverage          ?   96.90%           
=========================================
  Files             ?       14           
  Lines             ?      613           
  Branches          ?        0           
=========================================
  Hits              ?      594           
  Misses            ?       19           
  Partials          ?        0           

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[adobe-bot]

🎉 This PR is included in version 2.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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