The Rustdocs are clean CI job is failing

[alamb]

Describe the bug
The Rustdocs are clean job is failing on main.

An example https://github.com/apache/arrow-rs/actions/runs/17082191619/job/48438528718

Error: Unable to locate package libpython3.11-dev
Error: Couldn't find any package by glob 'libpython3.11-dev'
Error: Process completed with exit code 100.

To Reproduce

Expected behavior
CI should pass

Additional context
This first started happening in / after merging

• Implement cast and other operations on decimal32 and decimal64 #7815

I do not think the changes in that PR are related however

[klion26]

apt install -y libpython3.12-dev can work(verified on my local machine with ubuntu image), but did not found why libpython3.11-dev can't be located for now.

Not sure if it's ok to upgrade python version here.

[klion26]

If we need the 3.11 version for python, seems we can add a third repo by the following command, then apt install -y libpython3.11-dev can work.

https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa

apt install software-properties-common
add-apt-repository -y ppa:deadsnakes/ppa

[alamb]

Thanks @klion26 -- I looked around and it seems like the library isn't actually needed, so I propose removing it in

• Fix "Rustdocs are clean" CI Job #8176

[alamb]

label_issue.py automatically added labels {'parquet-variant'} from #8149