Fix another memory order issue

Fix another memory order issue

this adds another release/acquire link between update_qp and
get_hold_current_qp via the reader_idx because the current
one which is based on the qp users count is only preventing
a race condition, but does not help when the reader acquires
the next qp.

Fixes #27267

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28585)

(cherry picked from commit d296f9653345d79ee316c053f63a489f001565a5)