prep work for #49367
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added support for disowning Apple DEP devices, returning per-device
results (successful, failed, and inaccessible).
* **Bug Fixes**
* Improved consistency of authentication-related requests by carrying
over the original `User-Agent` when it is set.
* **Chores**
* Updated the bundled upstream dependency to a newer commit.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Magnus Jensen
d81902f83b