rpcd: update to latest Git HEAD

rpcd: update to latest Git HEAD

d442d62 plugin: fix double free in finish callback
ee26d83 main: exec_self: make clang analyzer happy
90e40bd file: exec: properly free memory on error
9ecfada uci: free configs list memory on return
32fba36 exec: always call finish_cb to allow plugin to free up memory
ca3e2d5 plugin: do not free method name separately
02c6e1d exec: properly free memory on rpc_exec() error
cc50263 plugin: exec: properly free memory on parse error
bd0ed25 uci: reset uci_ptr flags when merging set operations
37aa919 plugin: fix leaking invoked method name for exec plugins

Signed-off-by: Jo-Philipp Wich <jo@mein.io>