Bump actions/upload-artifact from 6 to 7 (#368)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
           DISPLAY: ':0'
         with: 
           prefix: xvfb-run -s '-screen 0 1024x768x24'
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         if: always()
         with:
           name: test_images