Bump actions/upload-artifact from 5 to 6 - #378

Changed pages include:

• benchmarking/tutorial/configuration.html - view
• benchmarking/json_report/json_schema/report_schema.html - view
• benchmarking/leaves/default-fibonacci-fibonacci-2025_12_05t14_29_01/leaf.html - view
• benchmarking/leaves/default-fibonacci-fibonacci-2025_12_05t14_29_01/report.html - view
• benchmarking/leaves/default-matrixvector-multiplication-2025_12_05t14_29_59/leaf.html - view
• benchmarking/leaves/default-matrixvector-multiplication-2025_12_05t14_29_59/report.html - view
• benchmarking/leaves/default-parallelsum-parallel_sum-2025_12_05t14_34_27/leaf.html - view
• benchmarking/leaves/default-parallelsum-parallel_sum-2025_12_05t14_34_27/report.html - view
• benchmarking/leaves/default-sortingapp-sorting-2025_12_05t15_03_01/leaf.html - view
• benchmarking/leaves/default-sortingapp-sorting-2025_12_05t15_03_01/report.html - view

There are more changes not included in the list