[7.x] Update webpack-dev-server and webpack-cli (#82844)

[legrego]

Backports the following commits to 7.x:

• Update webpack-dev-server and webpack-cli (Update webpack-dev-server and webpack-cli #82844)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: f0c4cdf

Metrics [docs]

async chunks size

id	before	after	diff
enterpriseSearch	666.5KB	666.5KB	+1.0B

page load bundle size

id	before	after	diff
upgradeAssistant	74.3KB	74.3KB	+1.0B

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream