chore(deps): update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/test.yml

@@ -33,14 +33,14 @@ jobs:
         run: pytest --cov plugin_scripts/ tests --cov-report xml:coverage-${{ matrix.python-version }}.xml --junitxml=test-results-${{ matrix.python-version }}.xml
 
       - name: Upload pytest test results artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: pytest-results-${{ matrix.python-version }}
           path: test-results-${{ matrix.python-version }}.xml
         if: ${{ always() }}
 
       - name: Upload coverage results artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: pytest-coverage-${{ matrix.python-version }}
           path: coverage-${{ matrix.python-version }}.xml