fix numpy version see https://stackoverflow.com/questions/78634235/nu…

…mpy-dtype-size-changed-may-indicate-binary-incompatibility-expected-96-from

requirements.txt

@@ -1,6 +1,7 @@
 grad-june>=0.1.8
 networkx>=3.0
 normflows>=1.6.2
+numpy==1.26.4
 pyyaml>=6.0
 tensorboard>=2.12.1
 torch>=2.0