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GH-34306: [CI][Packaging][RPM] Don't install utf8proc-devel on CentOS Stream 8 (#34307)

### Rationale for this change

It seems that it's removed recently.

### What changes are included in this PR?

This pull request just stops installing it because it's not used.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #34306
* Closes: #34306

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