Downgrade scikit-learn dependency version to 1.6

Author: lmcinnes

pyproject.toml

@@ -31,7 +31,7 @@ requires-python = ">=3.9"
 dependencies = [
     "numpy >= 1.23",
     "scipy >= 1.3.1",
-    "scikit-learn >= 1.8",
+    "scikit-learn >= 1.6",
     "numba >= 0.51.2",
     "pynndescent >= 0.5",
     "tqdm",
@@ -66,4 +66,4 @@ packages = ["umap"]
 zip-safe = false
 
 [tool.setuptools.package-data]
-"*" = ["*.pyx", "*.pxd"]
+"*" = ["*.pyx", "*.pxd"]