native_simulator: Get latest from upstream

Align with native_simulator's upstream main
19293fafc9959b03ece651e5e2afb768cfa891cf

Which includes:
19293fa misc trivial changes to please static analyzers
2a41263 nsi_tracing: Annotate functions as noreturn
f0307c1 nct: Simplify and improve switching performance
9f0c825 nce: Optimize/improve performance
63ce7e2 nsi_utils: Add macro to define static inline functions
6035bd8 nsi_errno: Minor optimization with no functional impact

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>