[Snyk] Security upgrade webpack-dev-server from 2.9.4 to 3.11.0

[snyk-bot]

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

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • packages/@css-blocks/website/package.json

⚠️ Warning

``` Failed to update the yarn.lock, please update manually before merging. ```

Vulnerabilities that will be fixed

With an upgrade:

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

Check the changes in this PR to ensure they won't cause issues with your project.

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