add the numpy pin explicitly

Author: atravitz

environment.yaml

@@ -15,3 +15,4 @@ dependencies:
   - python
   - openfe == 1.9.1
   - openff-interchange-base != 0.5.1  # https://github.com/openforcefield/openff-interchange/issues/1450
+  - numpy <=2.4.0  # https://github.com/OpenFreeEnergy/cinnabar/issues/198