CI: add dispatch to sync docs workflow

[slackapi]

Automated changes by create-pull-request GitHub action

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.85%. Comparing base (d07fadf) to head (772f3c9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #429   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files           7        7           
  Lines         702      702           
=======================================
  Hits          701      701           
  Misses          1        1           

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[zimeg]

#428