fix alpine image tag in Dockerfile (should be same as upstream) to ad…

[rogarcia]

…dress security vulnerabilities

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.23%. Comparing base (b720ac5) to head (19c37b9).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #200      +/-   ##
===========================================
- Coverage    57.23%   57.23%   -0.01%     
===========================================
  Files          600      600              
  Lines        80157    80157              
===========================================
- Hits         45878    45876       -2     
- Misses       30404    30410       +6     
+ Partials      3875     3871       -4     

see 16 files with indirect coverage changes

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