DOC: update link in benchmarks.md
- [x] closes #57850
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

The [H20.ai benchmark link](https://h2oai.github.io/db-benchmark/) in the [benchmarks webpage](https://pandas.pydata.org/community/benchmarks.html) contains the outdated benchmark results (e.g. the last benchmark was performed July 2021 and it used the pandas==1.2.5). DuckDB published a new benchmark results (e.g. the last benchmark was December 2023 with pandas==2.1.1) in the [link](https://duckdblabs.github.io/db-benchmark/) with the same approach described in [their blog](https://duckdb.org/2023/11/03/db-benchmark-update). So it's a good idea to replace the benchmark link. Thank you @rootsmusic for the issue.
/preview Website preview of this PR available at: https://pandas.pydata.org/preview/pandas-dev/pandas/57903/ Thank you @yukikitayama, very nice!  Thanks for your review @datapythonista 👍 