Test against node 18.x

[machisuke]

Summary

Test against node 18.x which is the current LTS version.
https://github.com/nodejs/release#release-schedule

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #1792 (712e8ae) into main (4f9a106) will not change coverage.
The diff coverage is n/a.

❗ Current head 712e8ae differs from pull request most recent head 781ebf6. Consider uploading reports for the commit 781ebf6 to get more accurate results

@@           Coverage Diff           @@
##             main    #1792   +/-   ##
=======================================
  Coverage   82.27%   82.27%           
=======================================
  Files          18       18           
  Lines        1523     1523           
  Branches      441      441           
=======================================
  Hits         1253     1253           
  Misses        172      172           
  Partials       98       98           

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[seratch]

Thank you!