Update `ard_survival_survfit` #50

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 a90ec49. ± Comparison against earlier commit c308c5e.