fix clippy failures

[andygrove]

Which issue does this PR close?

Closes #5080

Rationale for this change

New Rust nightly has new Clippy rules

What changes are included in this PR?

cargo clippy --fix

Are these changes tested?

Are there any user-facing changes?

[avantgardnerio]

I think this was done by an automated tool, so 👍

[alamb]

LGTM too -- thank you @andygrove

[ursabot]

Benchmark runs are scheduled for baseline = d588b47 and contender = 7e94826. 7e94826 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java

[alamb]

🎉