Auto merge of #21428 - kingdido999:rustfmt/allocator, r=jdm
Auto merge of #21428 - kingdido999:rustfmt/allocator, r=jdm

Format component allocator

<!-- Please describe your changes on the following line: -->
Format `components/allocator` with:

```bash
rustfmt components/allocator/*.rs
```

---
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- [ ] `./mach build -d` does not report any errors. Waiting for #21423 to be resolved.
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix a part of #21373.
- [x] These changes do not require tests because they format the code only.

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