fixup flydra_core: works in numpy 2

Author: astraw

Diff for: flydra_core/conftest.py

@@ -0,0 +1,8 @@
+import numpy as np
+import pytest
+
+
+@pytest.fixture(scope="session", autouse=True)
+def set_numpy_printoptions():
+    np.set_printoptions(legacy="1.25")
+