Update `ard_survival_survfit` #49

All 44 tests pass, 20 skipped in 9s

1 files ±0 64 suites ±0 9s ⏱️ ±0s
64 tests ±0 44 ✅ ±0 20 💤 ±0 0 ❌ ±0
181 runs ±0 149 ✅ ±0 32 💤 ±0 0 ❌ ±0

Results for commit c308c5e. ± Comparison against earlier commit 1564b51.