update py-elephant version in spack.yaml

spack.yaml

@@ -22,7 +22,7 @@ spack:
     - py-ebrains-drive@0.5.1
     - py-ebrains-kg-core@0.9.15
     - py-efel@4.0.4
-    - py-elephant@0.13.0
+    - py-elephant@0.14.0
     - py-fairgraph@0.11.1
     - py-frites@0.4.4
     - py-hbp-archive@1.1.1