Bump libsimulator submodule

[0xThiebaut]

Bump libsimulator submodule.

Fixes issues with SIGSTKSZ not being a constant anymore.

[20/42] Building CXX object CMakeFiles/acceptor.dir/test/main.cpp.o
FAILED: CMakeFiles/acceptor.dir/test/main.cpp.o 
/usr/bin/c++ -DBOOST_SYSTEM_DYN_LINK -DBOOST_SYSTEM_NO_LIB -I/libtorrent/simulation/libsimulator/include -g -std=gnu++14 -fdiagnostics-color=always -MD -MT CMakeFiles/acceptor.dir/test/main.cpp.o -MF CMakeFiles/acceptor.dir/test/main.cpp.o.d -o CMakeFiles/acceptor.dir/test/main.cpp.o -c /libtorrent/simulation/libsimulator/test/main.cpp
In file included from /usr/include/signal.h:328,
                 from /libtorrent/simulation/libsimulator/test/catch.hpp:6442,
                 from /libtorrent/simulation/libsimulator/test/main.cpp:21:
/libtorrent/simulation/libsimulator/test/catch.hpp:6465:33: error: size of array ‘altStackMem’ is not an integral constant-expression
 6465 |         static char altStackMem[SIGSTKSZ];
      |                                 ^~~~~~~~
/libtorrent/simulation/libsimulator/test/catch.hpp:6516:45: error: size of array ‘altStackMem’ is not an integral constant-expression
 6516 |     char FatalConditionHandler::altStackMem[SIGSTKSZ] = {};
      |                                             ^~~~~~~~
ninja: build stopped: subcommand failed.