Remove unnecessary Buffer::from_slice_ref reference

[tustvold]

Which issue does this PR close?

Closes #.

Rationale for this change

The current interface can result in rather unhelpful errors - #3158 (comment)

What changes are included in this PR?

Are there any user-facing changes?

Technically no, all previous uses will continue to work. However, clippy will complain about unnecessary borrows.

I ran the following to generate c05ab2d

cargo clippy --workspace --fix --all-targets
cargo fmt --all

[ursabot]

Benchmark runs are scheduled for baseline = ca92306 and contender = a6f140f. a6f140f 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-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-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