fix: Step in DateSlider

[hoxbro]

Fixes #7352

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.21%. Comparing base (07481b9) to head (b4e9dee).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7353      +/-   ##
==========================================
+ Coverage   81.40%   82.21%   +0.80%     
==========================================
  Files         337      337              
  Lines       50513    50513              
==========================================
+ Hits        41120    41528     +408     
+ Misses       9393     8985     -408     

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