Update dependency webpack-dev-server to v4.9.1

This MR contains the following updates:

Package	Type	Update	Change
webpack-dev-server	devDependencies	patch	4.9.0 -> 4.9.1

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

webpack/webpack-dev-server

v4.9.1

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