rpcd: update to latest Git HEAD

8c852b6 ucode: write ucode runtime exceptions to stderr
e80d0b2 ucode: pass-through `ubus_rpc_session` argument
0d02243 ucode: initialize module search path early
Signed-off-by: NJo-Philipp Wich <jo@mein.io>
(backported from commits 94129cbe
 and db17c752)

package/system/rpcd/Makefile

@@ -12,9 +12,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/rpcd.git
-PKG_MIRROR_HASH:=52ca9beab4b18afec9717a5f05c5232ef6160c3ece82a020851ac3aeaa52a29a
-PKG_SOURCE_DATE:=2022-08-24
-PKG_SOURCE_VERSION:=82904bd4f92e5928d047db6396cc14ca2b07d89f
+PKG_MIRROR_HASH:=18137fa6904b1a7aec03a16a4c25fd9b9689b24ee14d431bacdda9f093339071
+PKG_SOURCE_DATE:=2022-09-21
+PKG_SOURCE_VERSION:=8c852b656bf1622dee1ae2cfa4c083f730c1c539
 PKG_MAINTAINER:=Jo-Philipp Wich <jo@mein.io>
 
 PKG_LICENSE:=ISC