Fixed a debian python dependency name

.gitlab-ci.yml

@@ -59,6 +59,8 @@ build_wheel:
 build_debian:
   stage: build
   script:
+  # The Python package name provided by the python3-magic Debian package is "python-magic" rather than "file-magic".
+  - sed -re 's/file-magic/python-magic/' -i setup.py
   - echo -n > package/debian/matemat/usr/share/doc/matemat/changelog
   - |
     for version in "$(cat CHANGELOG.md | grep '<!-- BEGIN CHANGES' | cut -d ' ' -f 4)"; do