GH-50921: [C++] Fix Meson build failure in bundled bzip2

[Reranko05]

Rationale for this change

The Meson build fails when compiling the bundled bzip2 dependency due to an fdopen() implicit declaration error.

This updates the bundled bzip2 WrapDB package from 1.0.8-1 to 1.0.8-2, which contains an updated Meson packaging revision.

What changes are included in this PR?

• Update the bundled bzip2 WrapDB package from 1.0.8-1 to 1.0.8-2.

Are there any user-facing changes?

No.

Fixes: #50921

• GitHub Issue: [C++] Fix Meson build failure in bundled bzip2 #50921

[Reranko05]

@kou The original bzip2 failure is resolved, but the Meson build now fails later while linking arrow-buffer-test due to missing shared-library dependencies of libarrow.so.

I noticed that arrow_lib is built with arrow_deps, but arrow_dep only exposes link_with: arrow_lib and doesn't propagate arrow_deps:

arrow_dep = declare_dependency(
    include_directories: [include_dir],
    link_with: arrow_lib,
)

Would you prefer that I investigate and include a fix for this in this PR?