[ci/release] fix variable decl

[marscher]

Now arbitrary Python versions can be downloaded.

run of release pipeline looks good:
https://dev.azure.com/jpype-project/jpype/_build/results?buildId=1786&view=logs&j=b8057df5-3baa-5fec-ba79-03609ea2d5d9

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.12%. Comparing base (222d8ad) to head (344fdba).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1362      +/-   ##
==========================================
+ Coverage   86.10%   86.12%   +0.01%     
==========================================
  Files         112      112              
  Lines       10273    10273              
  Branches     4044     4044              
==========================================
+ Hits         8846     8848       +2     
+ Misses        822      821       -1     
+ Partials      605      604       -1     

see 1 file with indirect coverage changes

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[Thrameos]

Thanks. Sorry for the torture over 3.8.

[marscher]

I have no idea why the recent numpy regression test still crashes.

[Thrameos]

I will look over and see if I can figure out what is going on.