[BUG]: Imager uses older Bootloader image for Pi 5

### What happened? The imager gives the older 2026-05-11 default bootloader vs the current 2026-05-26 default ### Version 2.0.10 (Default) ### What host operating system were you using? Windows ### Host OS Version 10 22H2 ### Selected OS Bootloader ### Which Raspberry Pi Device are you using? Raspberry Pi 5, 500, and Compute Modules 5 ### What kind of storage device are you using? microSD Card in an internal reader ### OS Customisation - [ ] Yes, I was using OS Customisation when the bug occurred. ### Relevant log output ```shell ```