Constrain policyengine-core for US compatibility

Author: anth-volk

pyproject.toml

@@ -21,7 +21,7 @@ dependencies = [
     "inflect",
     "joserfc>=1.6.0",
     "modal>=1.3.0",
-    "policyengine-core>=3.26.5",
+    "policyengine-core>=3.26.0,<3.26.8",
     "policyengine_canada==0.96.3",
     "policyengine-ng==0.5.1",
     "policyengine-il==0.1.0",