chore(bench): fix benchmark compilation error

[rhysd]

What kind of change does this PR introduce?

• Bugfix
• Feature
• Docs
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

Checklist

• This PR will resolve #___
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.
• I have added a convincing reason for adding this feature, if necessary
• It can be built on all targets and pass CI/CD.

Other information

CI is failing because benchmark is broken due to compilation errors. This PR fixes them.

I confirmed the benchmark job passed on my forked repository: https://github.com/rhysd/wry/actions/runs/6362544684/job/17277632961

[wusyong]

Thanks for the PR! Could you sign the commits? I'll merge it once it's signed.

[rhysd]

@wusyong I signed my commit and force-pushed at 5f2cecc.