Don't hardcode python3 path in shebang

Dawid Dziurlarequested to merge
dawidd6/keycodemapdb:dawidd6-master-patch-16077 into master

https://github.com/Homebrew/homebrew-core/pull/121852

Python 3 could be available at different path. Let's use env to search for it instead of hardcoding.

Edited by Dawid Dziurla

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