[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

Examples/Tests/particle_boundary_interaction/PICMI_inputs_rz.py

@@ -4,6 +4,7 @@
 # --- This input is a simple case of reflection
 # --- of one electron on the surface of a sphere.
 import numpy as np
+
 from pywarpx import callbacks, particle_containers, picmi
 
 ##########################