[Snyk] Security upgrade webpack from 3.10.0 to 4.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • packages/react-scripts/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Prototype Pollution SNYK-JS-YARGSPARSER-560381	Yes	Proof of Concept

Commit messages

Package name: webpack

The new version differs by 250 commits.

• 213226e 4.0.0
• fde0183 Merge pull request webpack 5 support facebook/create-react-app#6081 from webpack/formating/prettier
• b6396e7 update stats
• f32bd41 fix linting
• 5238159 run prettier on existing code
• 518d1e0 replace js-beautify with prettier
• 4c25bfb 4.0.0-beta.3
• dd93716 Merge pull request CRA's sourcemaps don't match code in node_modules, which breaks IDE debugging facebook/create-react-app#6296 from shellscape/fix/hmr-before-node-stuff
• 7a07901 Merge pull request Object.assign not working with inheritance facebook/create-react-app#6563 from webpack/performance/assign-depth
• c7eb895 Merge pull request Generate .gitignore at the same time README.md and package.json are created (before npm install) facebook/create-react-app#6452 from webpack/update_acorn
• 9179980 Merge pull request yarn test adds isolatedModules to tsconfig, conflicts with declaration option facebook/create-react-app#6551 from nveenjain/fix/templatemd
• e52f323 optimize performance of assignDepth
• 6bf5df5 Fixed template.md
• 90ab23a Merge branch 'master' into fix/hmr-before-node-stuff
• b0949cb add integration test for spread operator
• 39438c7 unittest now also walks the ast
• 15ab027 Merge pull request perdon es solo una prueba facebook/create-react-app#6536 from jevan0307/sideEffects-selectors
• 1611ce1 Merge pull request NPM ERR! Code ELIFECYCLE facebook/create-react-app#6561 from joshunger/patch-1
• 6e175bc Merge pull request Refreshing app displays raw html without style for a while facebook/create-react-app#6549 from webpack/md4_hash
• 0637531 Add a hyperlink to create a new issue
• 0e1f9c6 Merge pull request Unexpected token after eject with Component Folders with package.json (comment on #5865) facebook/create-react-app#6554 from webpack/deps/end-of-beta
• 72477f4 upgrade versions to stable versions
• ed30285 Merge pull request Me facebook/create-react-app#6546 from webpack/bot/review-permission
• 40ee8c7 Use MD4 for hashing

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