fix: upgrade all dependencies (and fix UMD build)

[kentcdodds]

What: Update all deps and use dotenv-cli to set environment variables for the build

Why:

UMD Build output before:

[build] [umd] (!) Missing global variable name
[build] [umd] Use output.globals to specify browser global variable names corresponding to external modules
[build] [umd] react-dom/test-utils (guessing 'testUtils')

We no longer get that warning with these changes

How:

Using dotenv-cli to set environment variables based on .bundle.main.env and .bundle.pure.env which are used within kcd-scripts to configure rollup. Was way easier than setting them with cross-env like we were doing before.

Checklist:

• Documentation added to the
  docs site N/A
• Tests N/A
• Typescript definitions updated N/A
• Ready to be merged
  

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[codecov]

Codecov Report

Merging #653 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #653   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          103       103           
  Branches        15        15           
=========================================
  Hits           103       103           

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[kentcdodds]

🎉 This PR is included in version 10.0.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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