rgw/d4n: fix deprecated async_run overload in RedisPool

rgw/d4n: fix deprecated async_run overload in RedisPool

The async_run overload taking a logger argument is deprecated since
Boost 1.89. Use the 2-arg async_run(config, token) overload when
building with Boost >= 1.89, and fall back to the 3-arg overload
for Boost 1.87-1.88.

See https://www.boost.org/doc/libs/1_89_0/libs/redis/doc/html/redis/reference/boost/redis/basic_connection/async_run-04.html

Signed-off-by: Kefu Chai <k.chai@proxmox.com>