feat: add retry logic to GitHub API requests

[woodruffw]

This uses reqwest's semi-new retry policy APIs. These aren't the most feature-rich at the moment (notably they don't have backoff support), but they're good enough for our purpose 🙂

Closes #1216.

[kusari-inspector]

Kusari Analysis Results:

✅ No Flagged Issues Detected
All values appear to be within acceptable risk parameters.

No pinned version dependency changes, code issues or exposed secrets detected!

Note

View full detailed analysis result for more information on the output and the checks that were run.

---

@kusari-inspector rerun - Trigger a re-analysis of this PR
@kusari-inspector feedback [your message] - Send feedback to our AI and team
See Kusari's documentation for setup and configuration.
Commit: 10e335b, performed at: 2025-10-06T20:45:59Z

Found this helpful? Give it a 👍 or 👎 reaction!

[woodruffw]

(I don't have a great way to test this at the moment.)

[kusari-inspector]

Kusari PR Analysis rerun based on - 10e335b performed at: 2025-10-06T20:45:59Z - link to updated analysis

[github-actions]

Bencher Report

Branch	ww/retry
Testbed	ubuntu-latest

⚠️ WARNING: No Threshold found!

Without a Threshold, no Alerts will ever be generated.

• Latency (nanoseconds (ns))

Click here to create a new Threshold
For more information, see the Threshold documentation.
To only post results if a Threshold exists, set the --ci-only-thresholds flag.

Click to view all benchmark results

Benchmark	Latency	milliseconds (ms)
zizmor::grafana-9f212d11d0ac	📈 view plot ⚠️ NO THRESHOLD	316.84 ms

🐰 View full continuous benchmarking report in Bencher