Update GitHub Artifact Actions (#252)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/main.yml

@@ -68,7 +68,7 @@ jobs:
           echo "UUID=${UUID}" >> $GITHUB_ENV
           mv .coverage .coverage.${UUID}
       - name: upload coverage file
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: .coverage.${{ env.UUID }}
           path: .coverage.${{ env.UUID }}
@@ -90,7 +90,7 @@ jobs:
         with:
           version-file: pyproject.toml
       - name: Download coverage files
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           merge-multiple: true
           path: coverage_files