Fix node 18 type error

[jshawl]

This PR fixes an issue where crypto.subtle.verify expects a byte array for the signature instead of a string. see https://github.com/paypal/paypal-sdk-client/actions/runs/8009694187/job/21878949911#step:7:204

After this PR is merged, I would like to submit another PR to update the node version in main.yml:

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

Lines 17 to 19 in 639b4d5

	uses: actions/setup-node@v3
	with:
	node-version: "16"

because it differs from the publish action's node version:

paypal-sdk-client/.nvmrc

Line 1 in 639b4d5

18

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

Lines 11 to 18 in 639b4d5

	- name: 🤝 Set Node version from .nvmrc
	run: echo NVMRC=`cat .nvmrc` >> $GITHUB_ENV
	- 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 ✅

Comparison is base (639b4d5) 73.66% compared to head (a7fe098) 73.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  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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