**Related issue:** NA
## What & why
The FMA validator (`cmd/maintained-apps/validate`) downloads each app's
installer with a hardcoded 2-minute context timeout. Large installers
can't finish in that window — e.g. Android Studio (Windows) is ~1.39 GB,
which needs ~12.4 MB/s sustained to complete in 2 minutes. When the
runner is slower, the download aborts with `context deadline exceeded`,
failing validation with a misleading error that looks URL-related.
This bumps the validator timeout from 2 to 5 minutes. (For reference,
the production download path already uses `InstallerTimeout = 15 *
time.Minute`.)
# Checklist for submitter
- [x] Timeouts are implemented and retries are limited to avoid infinite
loops
## Testing
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* Increased the installer download timeout to five minutes, improving
reliability for slower downloads.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Allen Houchins
829064c7b2