Whitespace fixes

Author: rwb27

src/labthings_fastapi/outputs/blob.py

@@ -16,6 +16,7 @@
 class MyImageBlob(Blob):
     media_type = "image/png"
 
+
 class MyThing(Thing):
     @thing_action
     def get_image(self) -> MyImageBlob:

src/labthings_fastapi/types/numpy.py

@@ -7,6 +7,7 @@
 ```
 from labthings_fastapi.types.ndarray import NDArray
 
+
 def double(arr: NDArray) -> NDArray:
     return arr * 2  # arr is a numpy.ndarray
 ```