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GH-43122: [CI][Packaging][RPM][CentOS] Use vault.centos.org for SCL (#43127)

### Rationale for this change

We can't use http://mirrorlist.centos.org because CentOS 7 reached EOL.

### What changes are included in this PR?

Use https://vault.centos.org/ instead.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #43122

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