fix: fix miss makezero bug

[alingse]

I was running github actions to run linter makezero for top github golang repos.

see issues alingse/go-linter-runner#1

and the github actions output https://github.com/alingse/go-linter-runner/actions/runs/9242669752/job/25425781695

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append to slice `keyOrder` with non-zero initialized length at https://github.com/brianvoe/gofakeit/blob/master/xml.go#L16[9](https://github.com/alingse/go-linter-runner/actions/runs/9242669752/job/25425781695#step:4:10):14
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[brianvoe]

This is already fixed in an upcoming pr but thank your for your submission.