Update dependency webpack-dev-server to ^3.11.1

Created by: renovate[bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webpack-dev-server	^3.11.0 -> ^3.11.1

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Release Notes

webpack/webpack-dev-server

v3.11.1

Compare Source

3.11.1 (2020-12-29)

Bug Fixes

• the open option works using webpack serve without value (#​2948) (4837dc9)
• vulnerable deps (#​2949) (78dde50)

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