Update react and react-dom versions

[shawnmcknight]

Description 📝

Update peerDependencies to support react ^17.0.1 alongside ^16.8.0 and update devDependencies for react and react-dom to ^17.0.1.

Note: I attempted to update everything to make use of the new jsx transform but it appears that this would be a breaking change that prevented v16 of React from working. Once v16 support gets deprecated from this repo it can be revisited.

Relevant issues 🎯

N/A

Type of change 💎

• 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 not work as expected)

How Has This Been Tested? 🚦

CI passes. Tested locally using example within repo as well as from an external repo on both React 16.13.x and 17.0.1.

Checklist 🏁

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• New and existing unit tests pass locally with my changes
• My changes pass lint, prettier, and TS checks
• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas