dummy_tech: revert change in transistor y-offset

tests/data/dummy_tech/dummy_tech.py

@@ -185,7 +185,7 @@ gate_extension = 100
 # This showed to be too tricky to choose automatically because there are following trade offs:
 #   - Placing NMOS and PMOS rows closer to the center allows for shorter vertical wiring but makes the routing between the rows harder.
 #   - Also this offset must be chosen in a way such that the active region actually lies on at least one routing grid point.
-transistor_offset_y = 400
+transistor_offset_y = 125
 
 # Routing pitch
 routing_grid_pitch_x = unit_cell_width // 2