ARROW-14178: [C++] Boost download location has moved
ARROW-14178: [C++] Boost download location has moved

https://www.boost.org/users/news/boost_has_moved_downloads_to_jfr.html

Tagged releases on GitHub do not include submodules

Closes #11275 from bkmgit/bkmgit-update-boost-location

Authored-by: Benson Muite <e0844a8d1d85d7ae0a06d19fd8861a1c84037a1b@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

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