Fix iter_next_loop.rs ui test

[GuillaumeGomez]

I'm uncovering bugs while working on #11421. ^^'

changelog: none

[rustbot]

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[y21]

That's a fun one. It seems like originally (before it regressed) it was let vec = vec![1, 2, 3, 4];, but it doesn't seem like that matters for this lint. (just gonna steal this one since it's pretty trivial. also had to edit in a changelog: line otherwise CI will complain)

@bors r+

[bors]

📌 Commit a987c30 has been approved by y21

It is now in the queue for this repository.

[GuillaumeGomez]

Arf, I forgot the changelog line. Sorry about that and thanks for fixing it!

[bors]

⌛ Testing commit a987c30 with merge ef3cfaa...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: y21
Pushing ef3cfaa to master...