feat(cron): allow LW characters combination in the day-of-month field

[reugn]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.60%. Comparing base (a485399) to head (71fd0ef).

Files with missing lines	Patch %	Lines
quartz/cron.go	76.92%	2 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   94.59%   94.60%   +0.01%     
==========================================
  Files          20       20              
  Lines        1239     1243       +4     
==========================================
+ Hits         1172     1176       +4     
  Misses         49       49              
  Partials       18       18              

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