Fix build

[alamb]

Which issue does this PR close?

Fixes a build problem introduce in ff718d0 (a module was removed but there was still a reference to it)

Rationale for this change

CI is failing on master

What changes are included in this PR?

Remove pub mod declaration for removed module

Are there any user-facing changes?

No

[alamb]

I plan to merge this as soon as all the tests pass for me locally so we can fix master

[Dandandan]

Oops, thanks @alamb !

[ursabot]

Benchmark runs are scheduled for baseline = 31acc83 and contender = 634d912. 634d912 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