Update libmultiprocess library

Add detection for  int/enum size mismatch and recent fixes for undefined behavior.

bitcoin-core/libmultiprocess#121: ProxyClientBase: avoid static_cast to partially constructed object
bitcoin-core/libmultiprocess#120: proxy-types.h: add static_assert to detect int/enum size mismatch
bitcoin-core/libmultiprocess#127: ProxyClientBase: avoid static_cast to partially destructed object

Author: Sjors

depends/packages/native_libmultiprocess.mk

@@ -1,8 +1,8 @@
 package=native_libmultiprocess
-$(package)_version=abe254b9734f2e2b220d1456de195532d6e6ac1e
+$(package)_version=3b2617b3e59f55ae3501c82a62c87f393077779f
 $(package)_download_path=https://github.com/chaincodelabs/libmultiprocess/archive
 $(package)_file_name=$($(package)_version).tar.gz
-$(package)_sha256_hash=85777073259fdc75d24ac5777a19991ec1156c5f12db50b252b861c95dcb4f46
+$(package)_sha256_hash=b494ea08463ba0bca1758f4673bdda9250c393ad4aa5e93ba37825891c37a9d8
 $(package)_dependencies=native_capnp
 
 define $(package)_config_cmds