fix: Correctly specify @cypress/webpack-dev-server peerDependencies

[agg23]

• Closes warning " > @cypress/webpack-dev-server@1.1.1" has incorrect peer dependency "webpack-dev-server@>=4". #15805 and and open-ct complains about unknown property publicPath #15813

User facing changelog

Fixes incorrectly versioned peerDependencies for the @cypress/webpack-dev-server package. The package now requires webpack-dev-server@^3.0.0 rather than >= 4

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[cypress]

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Test summary

9492 • 0 • 111 • 3 • 0

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Run details

Project	cypress
Status	Passed
Commit	e9354dc
Started	Apr 6, 2021 6:42 PM
Ended	Apr 6, 2021 6:53 PM
Duration	11:52 💡
OS	Linux Debian - 10.8
Browser	Multiple

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[DamienCassou]

Thank you @agg23!