Update minor version of LFPykit to 0.5.1

spack.yaml

@@ -30,7 +30,7 @@ spack:
     - py-hbp-validation-client@0.8.2
     - py-hippounit@1.3.6
     - py-lfpy@2.3
-    - py-lfpykit@0.5
+    - py-lfpykit@0.5.1
     - py-libsonata@0.1.22
     - py-neo@0.12.0
     - py-nestml@5.2.0