Bump actions/upload-artifact from 4 to 6 (primer#3809)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: LiuLiu <liuliu-dev@github.com>

Author: dependabot[bot]

.github/workflows/test-visual.yml

@@ -87,7 +87,7 @@ jobs:
             [Review differences](https://github.com/primer/view_components/pull/${{ github.event.number }}/files?file-filters%5B%5D=.png&file-filters%5B%5D=.yml&show-viewed-files=false)
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COMMENT_IDENTIFIER: "visual-comparison-diff"
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         with:
           name: playwright-report
           path: .playwright/report/