depends: Update libmultiprocess library

Fix "connection: run async cleanups in LIFO not FIFO order"
chaincodelabs/libmultiprocess#101 is needed to prevent
CI failure https://cirrus-ci.com/task/4549686449668096 caused by wallet
processes deadlocking during shutdown when node process is killed.

This also includes other recent changes:

chaincodelabs/libmultiprocess#95: cmake: Introduce `LibmultiprocessMacros` module
chaincodelabs/libmultiprocess#96: cmake: Introduce packages
chaincodelabs/libmultiprocess#97: cmake: rename new packages and module introduced in bitcoin#95 and bitcoin#96
chaincodelabs/libmultiprocess#98: cmake: Combine installed packages
chaincodelabs/libmultiprocess#99: proxy-types: Fix missing space in server destroy log print
chaincodelabs/libmultiprocess#100: doc: Add various code comments and documentation
chaincodelabs/libmultiprocess#102: doc: Document shutdown sequences better

depends/packages/native_libmultiprocess.mk

@@ -1,8 +1,8 @@
 package=native_libmultiprocess
-$(package)_version=8da797c5f1644df1bffd84d10c1ae9836dc70d60
+$(package)_version=8b8a4766ce0a1892b9e8a5eb73dc39821005e520
 $(package)_download_path=https://github.com/chaincodelabs/libmultiprocess/archive
 $(package)_file_name=$($(package)_version).tar.gz
-$(package)_sha256_hash=030f4d393d2ac9deba98d2e1973e22fc439ffc009d5f8ae3225c90639f86beb0
+$(package)_sha256_hash=475c0dc2357a2ff30e9a164e4c16dc8a6597a57c9193d646fa9cbf0a55c45d78
 $(package)_dependencies=native_capnp
 
 define $(package)_config_cmds