1243 stripe demo node dependencies bumped

[nsallerin]

Description

react and react-dom updated from 16.9.0 to 16.12.0

React DOM

• Remove unstable_createRoot and unstable_createSyncRoot experimental APIs. (These are available in the Experimental channel as createRoot and createSyncRoot.) ([@acdlite]
• Clear additional fiber fields during unmount to save memory. (@trueadm in #16807)
• Prefer Object.is instead of inline polyfill, when available. (@ku8ar in #16212)

react-scripts updated from 16.9.0 to 16.12.0

https://github.com/facebook/create-react-app/blob/master/CHANGELOG.md

dotenv updated from 8.1.0 to 8.2.0

https://github.com/motdotla/dotenv/blob/master/CHANGELOG.md
---> no changes in changelog

stripe updated from 7.9.1 to 7.14.0

• #699 Add request-specific fields from raw error to top level error
• #719 Define 'type' as a property on errors rather than a getter
• #728 Remove duplicate export

Related Issue

[ch1243]

Motivation and Context

We want our dependencies up to date

How Has This Been Tested?

Running yarn test all tests passed

Types of changes

• Chore (non-breaking change which refactors / improves the existing code base)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  change)

Checklist:

• ✅ My code follows the code style of this project.
• 🔴 My change requires a change to the documentation.
• 🔴 I have updated the documentation accordingly.
• ✅ I have read the CONTRIBUTING document.
• 🔴 I have added tests to cover my changes.
• ✅ All new and existing tests passed.