modify the gpg config name

[Nicole00]

gpg config name in github is changed, GPG_PRIVATE_KEY -> JAVA_GPG_PRIVATE_KEY

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (d89652b) 63.81% compared to head (091b419) 63.84%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #519      +/-   ##
============================================
+ Coverage     63.81%   63.84%   +0.02%     
- Complexity      789      790       +1     
============================================
  Files            72       72              
  Lines          3828     3828              
  Branches        529      529              
============================================
+ Hits           2443     2444       +1     
  Misses         1016     1016              
+ Partials        369      368       -1     

see 1 file with indirect coverage changes

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