v1.9.3: fix reachable dependency vulnerabilities Closes reachable dependency vulnerabilities and removes a race from the retry test suite. - Updated `golang.org/x/crypto` to v0.57.0, fixing the reachable SSH authorization and certificate validation vulnerabilities GO-2026-6354 and GO-2026-6355. - Updated `github.com/moby/go-archive` to v0.3.3, fixing the reachable archive extraction vulnerability GO-2026-6253. - Retry tests now synchronize cancellation to observed service runs instead of relying on wall-clock sleeps that could expire before the service goroutine started under load.