Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -40,7 +40,7 @@ jobs:
           export CGAL_PYTHON_MODULE_VERSION
           python3 setup.py sdist
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.tar.gz
 
@@ -196,7 +196,7 @@ jobs:
             python $i
           done
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: endsWith(matrix.cgal_branch, env.LATEST_CGAL_VERSION)
         with:
           path: cgal-*.whl