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GH-44797: [CI] Update pkg-config to pkgconf on Homebrew (#44798)

### Rationale for this change

Some CI jobs are currently failing on main:

- [Python / ARM64 macOS 14 Python 3](https://github.com/apache/arrow/actions/runs/11936033926/job/33268789966?pr=44796)
- [C++ / ARM64 macOS 14 C++ ](https://github.com/apache/arrow/actions/runs/11935481942/job/33268873278)

### What changes are included in this PR?

Update from deprecated `pkg-config` to `pkgconf`

### Are these changes tested?

Via CI

### Are there any user-facing changes?

No
* GitHub Issue: #44797

Lead-authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Co-authored-by: Sutou Kouhei <kou@clear-code.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>