security: Bump webpack-dev-server to 4.7.4

[pedr0ni]

Bumped webpack-dev-server to fix selfsigned library vulnerability.

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[helenwilliamson]

bump as this is causing security warnings in my projects

[thomassth]

Any updates?
It's been 4 months since #12055

[OmegaDL2]

Any updates?

[samanehsan]

Hello! Are there any updates on when this will get merged? @iansu @mrmckeb

[BraianS]

Hello. @iansu @mrmckeb Any update on this? Thank you.