lifelines version constraints as generic as possible

setup.cfg

@@ -38,7 +38,7 @@ install_requires =
     scikit-learn>=1.2
     nflows>=0.14
     numpy>=1.20, <1.24
-    lifelines==0.27.7
+    lifelines>=0.27,!= 0.27.5, <0.27.8
     opacus>=1.3
     decaf-synthetic-data>=0.1.6
     optuna>=3.1