arrow

MINOR: [C++] Make clang-tidy stop complaining about C arrays (#36102)

### Rationale for this change

`std::array` is rarely a good fit for the kind of low-level array and buffer manipulation that Arrow does, so having `clang-tidy` complaining about C-style arrays confuses more than it helps.

### What changes are included in this PR?

Change in `.clang-tidy`.

### Are these changes tested?

I checked on my editor. Warnings not shown anymore.

Authored-by: Felipe Oliveira Carvalho <felipekde@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>