refactor: Adjust import formatting for improved readability

Author: chaoming0625

brainpy/inputs.py

@@ -2,12 +2,12 @@
 
 
 from brainpy._src.inputs.currents import (
-  section_input as section_input,
-  constant_input as constant_input,
-  spike_input as spike_input,
-  ramp_input as ramp_input,
-  wiener_process as wiener_process,
-  ou_process as ou_process,
-  sinusoidal_input as sinusoidal_input,
-  square_input as square_input,
+    section_input as section_input,
+    constant_input as constant_input,
+    spike_input as spike_input,
+    ramp_input as ramp_input,
+    wiener_process as wiener_process,
+    ou_process as ou_process,
+    sinusoidal_input as sinusoidal_input,
+    square_input as square_input,
 )