chore(deps): bump actions/upload-artifact from 4 to 7 (deepset-ai#3288)

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Author: dependabot[bot]

.github/workflows/docling_serve.yml

@@ -69,7 +69,7 @@ jobs:
 
       - name: Upload coverage comment to be posted
         if: matrix.python-version == '3.10' && runner.os == 'Linux' && github.event_name == 'pull_request' && steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: coverage-comment-docling_serve
           path: python-coverage-comment-action-docling_serve.txt