fix(keepLatest): use consistent condition name

[NullVoxPopuli]

when - keepLatest when this is true.
until - kinda means the opposite. So this word is a bug.

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	1f177cc
Status:	✅  Deploy successful!
Preview URL:	https://b96a937f.ember-resources.pages.dev
Branch Preview URL:	https://fix-keeplatest-api.ember-resources.pages.dev

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[github-actions]

Estimated impact to a consuming app, depending on which bundle is imported

	js	min	min + gzip	min + brotli
/index.js	12.49 kB	3.13 kB	1.28 kB	1.13 kB
├── core/class-based/index.js	4.1 kB	1.8 kB	883 B	761 B
├── core/function-based/index.js	5.71 kB	552 B	269 B	213 B
└── core/use.js	1.73 kB	415 B	256 B	203 B
/util/cell.js	1.93 kB	777 B	395 B	336 B
/util/debounce.js	2.64 kB	771 B	408 B	340 B
/util/ember-concurrency.js	5.17 kB	1.56 kB	745 B	632 B
/util/function-resource.js	216 B	154 B	123 B	87 B
/util/function.js	4.03 kB	1.78 kB	703 B	595 B
/util/helper.js	1.8 kB	303 B	218 B	177 B
/util/keep-latest.js	1.75 kB	519 B	292 B	236 B
/util/map.js	5.66 kB	2.38 kB	993 B	847 B
/util/remote-data.js	4.86 kB	1.75 kB	674 B	593 B

[github-actions]

🎉 This PR is included in version 5.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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