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GH-34973: [CI][Packaging] Fix script path in wheel-clean (#34974)

### Rationale for this change

> https://github.com/ursacomputing/crossbow/actions/runs/4587784310/jobs/8101540480
>
> ```text
> ruby: No such file or directory -- ./ci/scripts/gemfury_clean.rb (LoadError)
> ```

### What changes are included in this PR?

Fix the path.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #34973

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>