[mediacapture-image] new commits pushed by dontcallmedom

The following commits were just pushed by dontcallmedom to https://github.com/w3c/mediacapture-image:

* Allow workflow dispatch to republish spec

to help with fixing broken links identified in #295
  by Dominique Hazael-Massieux
https://github.com/w3c/mediacapture-image/commit/a93cbbe83a246b35fcdd63dd4f41c5473bb92d2c



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