fix: improve scheduler to support marko 6

[DylanPiercey]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 82.09%. Comparing base (1502f1e) to head (de64d2a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/shared.ts	37.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   83.78%   82.09%   -1.69%     
==========================================
  Files           3        3              
  Lines         222      229       +7     
  Branches       61       65       +4     
==========================================
+ Hits          186      188       +2     
- Misses         35       37       +2     
- Partials        1        4       +3     

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