iox-#459 Suppress ubsan error in test_posh_runtime.cpp
iox-#459 Suppress ubsan error in test_posh_runtime.cpp

Signed-off-by: Prasanna Bhat <e5bee0ecd0115ae065310834f9446360b4c750cd@gmail.com>

eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx