scikit-learn version less than 1.5.0 for python versions that do not support 1.5.0

Author: djm21

tox.ini

@@ -41,7 +41,7 @@ deps =
     tests: pytest-cov
     tests: betamax >= 0.8.1
     tests: betamax_serializers >= 0.2.0
-    tests: scikit-learn == 1.5.0
+    tests: scikit-learn <= 1.5.0
     tests: pandas < 2.0.0
     tests: cython               # required to install pandas from source
     tests: swat >= 1.8