replace numpy.bool with bool 3/N

Summary:
numpy.bool is long deprecated and removed starting numpy-1.20.0 [1]. This replaces all references with equivalent `bool` type using the following oneliner:
```
rg '\bnp\.bool\b' -lg '.py' fbcode | xargs perl -pi -e 's,\bnp\.bool\b,bool,'
```
Selected some changes and applied arc lint.

1. https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations

Reviewed By: florazzz

Differential Revision: D50476847

fbshipit-source-id: 2d96df95b5af5f09aae0b33583f4613105cd10d6

torchbenchmark/models/Background_Matting/test_pre_process.py

@@ -62,7 +62,7 @@ def adjustExposure(img,back,mask):
 	kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (3, 3))
 	mask = cv2.dilate(mask, kernel, iterations=10)
 	mask1 = cv2.dilate(mask, kernel, iterations=300)
-	msk=mask1.astype(np.float32)/255-mask.astype(np.float32)/255; msk=msk.astype(np.bool)
+	msk=mask1.astype(np.float32)/255-mask.astype(np.float32)/255; msk=msk.astype(bool)
 
 	back_tr=back
 	back_tr[...,0]=bias_gain(img[...,0],back[...,0],msk)

torchbenchmark/models/Background_Matting/test_pre_process_video.py

@@ -61,7 +61,7 @@ def adjustExposure(img,back,mask):
 	kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (3, 3))
 	mask = cv2.dilate(mask, kernel, iterations=10)
 	mask1 = cv2.dilate(mask, kernel, iterations=300)
-	msk=mask1.astype(np.float32)/255-mask.astype(np.float32)/255; msk=msk.astype(np.bool)
+	msk=mask1.astype(np.float32)/255-mask.astype(np.float32)/255; msk=msk.astype(bool)
 
 	bias=np.zeros((1,3)); gain=np.ones((1,3))