Fix #6687 EADDRINUSE

[HarunOr]

Fixes a non-critical bug where an EADDRINUSE error was thrown when running next dev.

Apart from the fact that you don't need the timeout here, the cause for the error message might be related to this NodeJS issue.

Resolves #6687

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Latest commit: 08ab057

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@keystone-next/keystone	Patch

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[HarunOr]

Tested it again today, and the bug reappeared. Timing issues are so annoying.