fix(karma-webpack): make webpackMiddleware optional

[Den-dp]

make webpackMiddleware optional as per codymikol/karma-webpack#418 change and 4.0.2 release https://github.com/codymikol/karma-webpack/releases/tag/v4.0.2

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[typescript-bot]

@Den-dp Thank you for submitting this PR!

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1 package in this PR

• karma-webpack — on npm, on unpkg
  • owner-approval: @mtraynham

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---

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[typescript-bot]

🔔 @mtraynham — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

[typescript-bot]

@Den-dp The CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

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[typescript-bot]

@Den-dp: Everything looks good here. I am ready to merge this PR (at a666b57) on your behalf whenever you think it's ready.

If you'd like that to happen, please post a comment saying:

Ready to merge

and I'll merge this PR almost instantly. Thanks for helping out! ❤️

(@mtraynham: you can do this too.)

[Den-dp]

Ready to merge