text: Title: morphology.thin change the original image from version 0.23
  Body: ### Description:
  
  From version 0.23 document, the original image changes into thinned image.
  https://scikit-image.org/docs/0.23.x/auto_examples/edges/plot_skeleton.html
  ![image](https://github.com/scikit-image/scikit-image/assets/72567578/e447b924-5ab8-49fb-9ac1-5dc024ee0f10)
  
  In version 0.22, it seems ok.
  https://scikit-image.org/docs/0.22.x/auto_examples/edges/plot_skeleton.html
  ![image](https://github.com/scikit-image/scikit-image/assets/72567578/9dd6243c-670a-4eee-8be4-21c97b9bbe55)
  
  