build(deps): bump actions/upload-artifact from 4.6.2 to 6.0.0 (#1203)

Author: dependabot[bot]

.github/workflows/mutation-testing.yml

@@ -77,7 +77,7 @@ jobs:
           } >> "$GITHUB_STEP_SUMMARY"
 
       - name: Upload mutation results
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02  # v4.6.2
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: mutants-${{ matrix.package }}