Upgrade webpack devDependencies to ^5.37

[ShimiSun]

Expected Behavior

webpack devDependencies should point to the latest ^5.37

Actual Behavior

"webpack": "^4.39.3",
"webpack-cli": "^3.2.3"

Steps to Reproduce

1. Go to grommet/package.json
2. Upgrade webpack

Your Environment

• Grommet version: 2.17.2

[jcfilben]

Storybook is currently only supporting webpack 5 experimentally and v6 of storybook is still trying to use webpack 4. Because of this we are holding off on the webpack upgrade until storybook fully supports webpack 5 (most likely in storybook v7). Linking to https://github.com/storybookjs/storybook/issues/13893 More information about storybook's experimental support of webpack 5 https://storybook.js.org/blog/storybook-for-webpack-5/

[halocline]

"ts-loader": "^8.3.0" --> "^9.2.0" and "copy-webpack-plugin": "^5.0.4" --> "^9.0.0" should be upgraded when this work is done as well. Both are dependent on Webpack 5.