Avoid the breaking change in dependency cron_descriptor v2

[rh0dium]

Fixes #934
Fixes #936
Fixes #937

• cron_descriptor needs to be locked down as the new release changes the signature. #934
• Update import handling for cron_descriptor > 2.0.x compatibility # 934 Real Fix #936
• Issue with the cron-descriptor #937
• https://pypi.org/project/cron-descriptor
• https://github.com/Salamek/cron-descriptor/releases

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.18%. Comparing base (66b4434) to head (ccec7ee).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #935   +/-   ##
=======================================
  Coverage   88.18%   88.18%           
=======================================
  Files          32       32           
  Lines        1007     1007           
  Branches      105      105           
=======================================
  Hits          888      888           
  Misses        101      101           
  Partials       18       18           

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[cclauss]

cron-descriptor v2 seems to break too much.

@Salamek