rgw: updating the boost_redis submodule version to point to

`develop` branch.

Signed-off-by: Pritha Srivastava <prsrivas@redhat.com>

diff --git a/src/boost_redis b/src/boost_redis
index 46525371b9247a1ec208a6157880ec77f5ddadc4..a6b8017fb265b1cf2dcee454173d6758202f8503 160000 (submodule)
--- a/src/boost_redis
+++ b/src/boost_redis
@@ -1 +1 @@
-Subproject commit 46525371b9247a1ec208a6157880ec77f5ddadc4
+Subproject commit a6b8017fb265b1cf2dcee454173d6758202f8503