chore: python-3.14 +freethreading

Author: wdconinc

spack-environment/packages.yaml

@@ -340,7 +340,8 @@ packages:
     - +fastjet +root
   python:
     require:
-    - '@3.13'
+    - '@3.14'
+    - +freethreading
   py-awkward:
     require:
     - '@2.6.6:'