use node version from .nvmrc in ci

[jshawl]

This PR fixes an issue where pull requests are tested using node 16 but npm publish actions are tested using node 18.

I copied over the yaml from publish.yml:

paypal-sdk-client/.github/workflows/publish.yml

Lines 14 to 18 in 4b87e82

	- name: ⎔ Setup node
	# sets up the .npmrc file to publish to npm
	uses: actions/setup-node@v3
	with:
	node-version: ${{ env.NVMRC }}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.66%. Comparing base (4b87e82) to head (f39535c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   73.66%   73.66%           
=======================================
  Files          23       23           
  Lines        2035     2035           
  Branches      240      240           
=======================================
  Hits         1499     1499           
  Misses        526      526           
  Partials       10       10           

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[wsbrunson]

thank you!