Use Sha-256 in ziputils

[msaroufim]

Solves https://github.com/pytorch/serve/security/code-scanning/11

[codecov]

Codecov Report

Merging #2629 (c9b8c05) into master (d8a1146) will decrease coverage by 0.11%.
The diff coverage is n/a.

❗ Current head c9b8c05 differs from pull request most recent head a540cd9. Consider uploading reports for the commit a540cd9 to get more accurate results

@@            Coverage Diff             @@
##           master    #2629      +/-   ##
==========================================
- Coverage   71.34%   71.24%   -0.11%     
==========================================
  Files          85       85              
  Lines        3905     3905              
  Branches       58       58              
==========================================
- Hits         2786     2782       -4     
- Misses       1115     1119       +4     
  Partials        4        4              

see 2 files with indirect coverage changes

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