fix(bench): update parallel saving part

[lwaekfjlk]

Closes #

📑 Description

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed
• Branch name follows type/descript (e.g. feature/add-llm-agents)
• Ready for code review

ℹ Additional Information

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 72.92%. Comparing base (e0e14f4) to head (9e77e2a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
research_bench/create_bench_from_paper_links.py	0.00%	17 Missing ⚠️

@@            Coverage Diff             @@
##             main     #835      +/-   ##
==========================================
+ Coverage   72.90%   72.92%   +0.02%     
==========================================
  Files          80       80              
  Lines        3425     3424       -1     
==========================================
  Hits         2497     2497              
+ Misses        928      927       -1     

Files with missing lines	Coverage Δ
research_bench/create_bench_from_paper_links.py	0.00% <0.00%> (ø)