[Backport 2.0] Remove node version in package.json

[opensearch-trigger-bot]

Backport cb8a61b from #186

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (2.0@91f7e94). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head cb8a61b differs from pull request most recent head 0d770ec. Consider uploading reports for the commit 0d770ec to get more accurate results

@@          Coverage Diff           @@
##             2.0     #187   +/-   ##
======================================
  Coverage       ?   61.85%           
======================================
  Files          ?      158           
  Lines          ?     4632           
  Branches       ?      732           
======================================
  Hits           ?     2865           
  Misses         ?     1546           
  Partials       ?      221           

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