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GH-43158: [Packaging] Use bundled nlohmann/json on AlmaLinux 8/CentOS Stream 8 (#43159)

### Rationale for this change

Because json-devel on them don't provide nlohmann/json_fwd.h that is required by google-cloud-cpp.

The upstream issue:
https://github.com/googleapis/google-cloud-cpp/issues/14438

### What changes are included in this PR?

Use bundled nlohmann/json instead.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #43158

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