Fix NumPy casting error in blur_blending_cv2 function

[sayedgamal99]

Description

This PR fixes a NumPy casting error in the blur_blending_cv2 function in the Face_Detection module. The error occurs when multiplying a mask (likely of type uint8) by 255.0, resulting in a casting error:

numpy.core._exceptions._UFuncOutputCastingError: Cannot cast ufunc 'multiply' output from dtype('float64') to dtype('uint8') with casting rule 'same_kind'

Changes

• Modified the blur_blending_cv2 function to convert the mask to float64 before multiplication
• This allows the multiplication to happen without overflow issues
• The result is then properly scaled back for further processing

Testing

The fix has been tested on various images and resolves the casting error that was occurring

Follow Up

Also Fixed the same function in the HR file simply.

[sayedgamal99]

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