http_client: Ensure GitHub digest prefix is always stripped (#64905)
## Summary
Fixes an inconsistency we had when deserializing responses from the
GitHub releases API.
## Testing
Added some deserialization tests that describe the intended behavior
## Self-review
- [X] I've reviewed my diff for quality, security, reliability, and
performance.
- [X] Tests cover the new or changed behavior.
Release Notes:
- N/A
ead2d9eac0Finn Evers committed on 9/29/2026, 9:20:46 AM· committed by GitHubparentbd74733