Fix arm64 detection logic

[ssbarnea]

Fixes: #369

[ssbarnea]

@eliask May you please press the magic approve button so we can see the results?

PS. BTW, I also noted some tox.ini config mistakes which prevents its use by some users. To be more clear, presence of tox-ev plugin breaks it as you rely solely on pip commands instead of allowing tox to manage dependencies itself.

[ssbarnea]

@ekalinin Maybe you could disable to approval to allow us to test our PR? There is nothing in the GHA workflow file to cause concerns and github runners are free for open-source anyway. Tx