Merge pull request #30023 from tchaikov/wip-get-req

mon,osd: use get_req<> instead of static_cast<>(get_req())

Reviewed-by: Greg Farnum <gfarnum@redhat.com>

diff --cc src/osd/OSD.cc
Simple merge

diff --cc src/osd/PrimaryLogPG.cc
Simple merge

diff --cc src/osd/ReplicatedBackend.cc
Simple merge