build(deps): bump actions/upload-artifact from 5 to 6 (#104)

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -51,7 +51,7 @@ jobs:
         run: uv run pytest --cdist-group=${{ matrix.cdist-group }}/3 -k "not elasticsearch"
 
       - if: matrix.python-version == '3.12'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-xml
           path: coverage.xml