chore(deps): upgrade to node v20

[agilgur5]

Supersedes / Closes #432

Motivation

• node v14 is EoL and has been since April 2023
• node v20 is the current LTS version

Modifications

• update .nvmrc to Node v20

• ~update all actions/setup-node GH Actions to use the .nvmrc for consistency~ EDIT: that ended up being completed as part of #509

• due to an old version of Storybook / Webpack, we have to run all Storybook scripts with NODE_OPTIONS='--openssl-legacy-provider'

  • this must be used if we use newer versions of node without upgrading Storybook + Webpack
  • unfortunately, upgrading Storybook is significantly easier said than done, especially since there are 3 different Storybook builds in this repo (v1, v2, and antd). See https://github.com/argoproj/argo-ui/pull/432#issuecomment-1879816619 noting my trials and tribulations with that
    • so put that off for now (or ever? since this repo is not maintained much anymore)
    • potentially leave Storybook as-is and have it use Webpack v5? See also https://github.com/argoproj/argo-ui/issues/469#issuecomment-1879870424
  • note that this is an insecure run-time configuration (which is why it was deprecated and is legacy), but since it is only used in development, it's not a significant vulnerability

Verification

Install works, builds pass, tests pass

Future Work

1. Storybook upgrade, maybe never.
   • See https://github.com/argoproj/argo-ui/pull/432#issuecomment-1879816619 on how difficult that is
2. Webpack upgrade, maybe doable. Then can remove --openssl-legacy-provider
   • Storybook v6 supports Webpack v5 optionally (Webpack v4 is the default)
3. Have dependabot stop updating deps with breaking changes... 😐
   • EDIT: Completed in #537

[agilgur5]

Fixed merge conflicts

[github-actions[bot]]

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