change numpy to be less than version 2.0.0 in tox tests

Author: djm21

tox.ini

@@ -43,6 +43,7 @@ deps =
     tests: betamax_serializers >= 0.2.0
     tests: scikit-learn < 1.5.0
     tests: pandas < 2.0.0
+    tests: numpy < 2.0.0
     tests: cython               # required to install pandas from source
     tests: swat >= 1.8
     tests: kerberos ; platform_system != "Windows" and platform_system != "Darwin"