Use explicit key format when mapping key wraps

[kovsu]

Description

fix: #10879

Checklist

• [x] I’ve added tests to confirm my change works.
• [x] (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory).
• [x] (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• [x] I’ve read the contributing guidelines.

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commit: 0c19434

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[fisker]

This seems incorrect to me, but stable version, also format like this. Not sure why we don' allow break after :

Prettier pr-18330 Playground link

--parser yaml
--print-width 1

Input:

foo foo foo foo foo foo foo foo foo: 
 bar

Output:

foo foo foo foo foo foo foo foo foo: bar