Change minimum time between cronjobs to 15 seconds

[Mrtenz]

This changes the minimum time between cronjob executions to 15 seconds.

Related to: MetaMask/pm-security#392.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.93%. Comparing base (9047dbf) to head (03d9ca5). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3198   +/-   ##
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  Coverage   94.93%   94.93%           
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  Files         507      507           
  Lines       11185    11185           
  Branches     1722     1722           
=======================================
  Hits        10619    10619           
  Misses        566      566           

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[ulissesferreira]

Question folks, why 15 seconds and not other lower values?