Update Khepri to v0.4.0

Author: dumbbell

deps/rabbit/Makefile

@@ -148,7 +148,7 @@ dep_syslog = git https://github.com/schlagert/syslog 4.0.0
 dep_osiris = git https://github.com/rabbitmq/osiris main
 dep_systemd = hex 0.6.1
 dep_seshat = hex 0.3.2
-dep_khepri = git https://github.com/rabbitmq/khepri.git 4a90536f14fce7a72e5d0dc5a5348c2b348939d7
+dep_khepri = git https://github.com/rabbitmq/khepri.git e34f7bd5b0597229d98a0013565c704658e223ba
 
 define usage_xml_to_erl
 $(subst __,_,$(patsubst $(DOCS_DIR)/rabbitmq%.1.xml, src/rabbit_%_usage.erl, $(subst -,_,$(1))))