Use correct listenAddress for Karma on node 18+

[JasonElkin]

Prerequisites

• I have added steps to test this contribution in the description below

From Node.js 17 DNS resolution is different, causing the Karma server to listen to the wrong address by default. This breaks Umbraco's gulp test tasks and default gulp build.

Telling the karma server to listen on :: fixes the problem - as per the issue on the Karma repo. This change is backwards compatible down to (at least) Node.js v14 so doesn't change version requirements for Umbraco 🎉

To test: run gulp build from /src/Umbraco.Web.UI.Client on any version from Node.js from 14+

I've tested on 14, 16, 18 and 19

Once this is merged, it would be worth checking if HQ can bump the Node.js version in the pipelines to latest LTS.

[github-actions]

Hi there @JasonElkin, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
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• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
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[nul800sebastiaan]

Thanks @JasonElkin - works on my machine now as well!
FYI: I didn't add an Umbraco version to this, because it's not relevant for anyone but contributors / build servers.

[nul800sebastiaan]

Cherry picked for the v10 branch as well so it's easier to work on for everyone, thanks again @JasonElkin! 53c547f