Upgrade dependencies - May 2021

• Review release notes updates since last global upgrade of dependencies
• Upgrade all dependencies to the latest versions, except for any dependencies that we are being more cautious with.
• Make any adjustments to code and configurations based on release note suggestions
• Perform manual regression test using guide
• Create follow-up tasks to attempt upgrade in July 2021 and finish upgrade in October 2021. - This was done here: Upgrade dependencies dry run - July 2021  #355.

time box: 2 days

Notable upgrades:

• nextjs minor versions (detailed discussions on ReScript forum about problems with webpack upgrade bundled with nextjs)
• reason-react -> rescript-react
• upgrade react to catch up with nextjs demands

Apply this fix: next transpile hack. next-transpile-modules fixed this issue with release 7.1.0, so this wasn't needed.

• Take new ReScript-vscode plugin

Switch from bsc to new rescript cli wrapper.

Update: Perform this switch as part of the next upgrade. We are targeting 9.0.x in this upgrade, which doesn't provide the new rescript-cli, IIRC.

• Remove the explicit postcss dependency, allow nextjs to bring it transitively again.

• Pin the version of bsconfig schema to the exact compiler version. It currently references the master branch: "$schema": "https://raw.githubusercontent.com/rescript-lang/rescript-compiler/master/docs/docson/build-schema.json",

• Review release notes updates since last global upgrade of dependencies
• Upgrade all dependencies to the latest versions, except for any dependencies that we are being more cautious with.
• Make any adjustments to code and configurations based on release note suggestions
• Perform manual regression test using guide
• Pin the version of bsconfig schema to the exact compiler version. It currently references the master branch: "$schema": "https://raw.githubusercontent.com/rescript-lang/rescript-compiler/master/docs/docson/build-schema.json",
• Remove the explicit postcss dependency, allow nextjs to bring it transitively again

All of these tasks will be done as part of #354, with the exception of upgrading mdast-util-to-string. I will deal with mdast-util-to-string in a follow-up PR.

Review the following release notes:

• next-js
• react, react-dom
• @rescript/react
• bs-platform
• tailwindcss
• webpack
• postcss
• js-yaml
• graymatter
• next-transpile-modules
• autoprefixer
• rescript-vscode plugin
• concurrently
• mdast-util-to-string