fix: pin eslint-plugin-n to ^15.7 to support node 14

[MichaelGoberling]

Description

Version ^16.0 of eslint-plugin-n doesn't support Node 14, but aio still does. Pin to ^15.7 for now

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [x] 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)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #134 (9a301c6) into master (a22c436) will not change coverage. Report is 1 commits behind head on master. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #134   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          567       567           
  Branches       109       109           
=========================================
  Hits           567       567           

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