Update requirements.txt

[btajiboy]

in the demo_toolbox need 1.21 numbpy for get running

[ramonmeza]

Updating numpy version to 1.21 fixed issues I was having running the app on Win10 with Python 3.10.5.

[JulienGremillot]

For me this didn't work for compatibility issue with librosa. I resolved this by specifying the version of numba :
numba==0.56.4

[Tatsh]

requirements.txt should not be seen as a binary file.

[Tatsh]

Convert this back to UTF-8 please: iconv -f utf16 < requirements.txt > new && mv new requirements.txt. Preferably remove the CRLF line endings too.