fix: cron expression in gc is wrong

[Alive-Fish]

https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/36433517

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.24%. Comparing base (c6385db) to head (eb4d5c1).
⚠️ Report is 4 commits behind head on release/6.5.

Additional details and impacted files

@@             Coverage Diff              @@
##           release/6.5   #15157   +/-   ##
============================================
  Coverage        89.24%   89.24%           
============================================
  Files              618      618           
  Lines            37993    37993           
  Branches          7714     7685   -29     
============================================
  Hits             33905    33905           
  Misses            1972     1972           
  Partials          2116     2116           

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