Fix NPM MUSL release

[avifenesh]

NPM release for musl is broken, showing the wrong path and failing to find the files.
After some nice amount of digging - the new version of alpine dockers, 3.20, has some incompatibility with what is going on underline npm publish.

Apparently it is not the first time such a thing has happened, digging around the web I could find an older version in which it happened as well, caused by python default version change, which was used by some npm tools, and the change broke the ability to publish.

The solution is hard-coding 3.19 instead of letting GH to choose the latest.
This should stay open so we check in the future if this has been fixed, and if so to change back so GH takes the latest and the value is not hard coded.