Remove macOS 14 from build matrix in GitHub Actions workflow

ci: disable PyPI attestations to fix twine wheel validation failure

Fix: Remove duplicate import of guidata.io in masked.py

Bump version to 2.8.1

Fix snapshot tool crashes and black images for XY image items

- Fix SystemError when taking snapshots of XYImageItem/MaskedXYImageItem
  by converting src_rect from list to tuple before passing to C extension
- Add export_roi method to XYImageItem to properly handle coordinate
  transformations using _scale_xy instead of _scale_rect
- Fixes snapshot rendering producing black images for non-uniform coordinates

Merge branch 'develop'

Fix update_status method in cross-section tools to retrieve all image…

… items

Fix #47

Merge branch 'master' of https://github.com/Codra-Ingenierie-Informat…

…ique/plotpy

# Conflicts:
#	CHANGELOG.md

Replace deprecated icon files with new SVG icons for selection tools

Update CHANGELOG.md to include issue #32