Remove vendored code from scikit-image

[ericpre]

Fix for hyperspy/hyperspy-extensions-list#111.

It doesn't seem to be necessary anymore - from looking at the history, it was introduced during the split and the only difference is around support of scikit-image for version <0.20. Currently, the requirement is scikit-image>=0.20.

Progress of the PR

• Remove vendored scikit-image code,
• [n/a] update docstring (if appropriate),
• [n/a] update user guide (if appropriate),
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:rosettasciio build of this PR (link in github checks)
• [n/a] add tests,
• ready for review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.84%. Comparing base (558f7a9) to head (51bee2e).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #527      +/-   ##
==========================================
+ Coverage   88.80%   88.84%   +0.03%     
==========================================
  Files         113      112       -1     
  Lines       13135    13113      -22     
  Branches     2425     2421       -4     
==========================================
- Hits        11665    11650      -15     
+ Misses        923      920       -3     
+ Partials      547      543       -4     

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[Copilot]

Pull request overview

This PR removes RosettaSciIO’s vendored copy of skimage.exposure.rescale_intensity now that the project targets scikit-image>=0.20, and updates the Blockfile writer to use the upstream scikit-image implementation directly. This reduces maintenance burden and eliminates version-conditional behavior that was only needed for older scikit-image releases.

Changes:

• Removed the vendored rescale_intensity implementation (rsciio/utils/_skimage_exposure.py).
• Updated Blockfile writing code to import/use skimage.exposure.rescale_intensity directly when intensity scaling is requested.
• Added a Towncrier changelog fragment documenting the maintenance change.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
upcoming_changes/527.maintenance.rst	Adds a maintenance changelog entry for the removal of vendored scikit-image code.
rsciio/utils/_skimage_exposure.py	Deletes the vendored rescale_intensity implementation.
rsciio/blockfile/_api.py	Switches Blockfile intensity scaling to use skimage.exposure.rescale_intensity directly.

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