fix(contrib/opensergo): incorrect conversion between integer types

[demoManito]

Description (what this PR does / why we need it):

https://github.com/go-kratos/kratos/security/code-scanning/2

Which issue(s) this PR fixes (resolves / be part of):

Other special notes for the reviewers:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.78%. Comparing base (a803e9d) to head (854d5c7).

❗ Current head 854d5c7 differs from pull request most recent head c39b305. Consider uploading reports for the commit c39b305 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3309      +/-   ##
==========================================
- Coverage   81.92%   81.78%   -0.15%     
==========================================
  Files          92       92              
  Lines        4205     4205              
==========================================
- Hits         3445     3439       -6     
- Misses        580      584       +4     
- Partials      180      182       +2     

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[kratos-ci-bot]

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@ magical buns