Update babel config to transpile down to node 14

[brophdawg11]

Closes #5043

To test, run yarn build and look at build/node_modules/@remix-run/react/dist/components.js and confirm that around line 108 you don't see any ||= operators.

Here's the diff between a 1.10.0 build and a build on this branch:

~/me/shopify/repos/remix (brophdawg11/node-14-build)> diff -r build-current build
diff -r build-current/node_modules/@remix-run/react/dist/components.js build/node_modules/@remix-run/react/dist/components.js
109,110c109,110
<     CatchBoundary ||= errorBoundaries.RemixRootDefaultCatchBoundary;
<     ErrorBoundary ||= errorBoundaries.RemixRootDefaultErrorBoundary;
---
>     CatchBoundary || (CatchBoundary = errorBoundaries.RemixRootDefaultCatchBoundary);
>     ErrorBoundary || (ErrorBoundary = errorBoundaries.RemixRootDefaultErrorBoundary);
diff -r build-current/node_modules/@remix-run/react/dist/esm/components.js build/node_modules/@remix-run/react/dist/esm/components.js
85,86c85,86
<     CatchBoundary ||= RemixRootDefaultCatchBoundary;
<     ErrorBoundary ||= RemixRootDefaultErrorBoundary;
---
>     CatchBoundary || (CatchBoundary = RemixRootDefaultCatchBoundary);
>     ErrorBoundary || (ErrorBoundary = RemixRootDefaultErrorBoundary);

[changeset-bot]

🦋 Changeset detected

Latest commit: 2ec4fcf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
@remix-run/react	Patch
@remix-run/testing	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/deno	Patch
@remix-run/dev	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/netlify	Patch
@remix-run/node	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/vercel	Patch

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