fix: don't use deprecated searchForIssuesUsingJqlPost() method

[jamacku]

Blocked by: MrRefactoring/jira.js#390

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.95%. Comparing base (b273508) to head (84553f7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
+ Coverage   48.78%   48.95%   +0.17%     
==========================================
  Files           7        7              
  Lines         574      576       +2     
  Branches       44       44              
==========================================
+ Hits          280      282       +2     
  Misses        294      294              

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