Remove vendored submodule from libdbus-sys #2295

Job	Run time
checks (make -f Makefile clippy, 1.73.0, clippy)	2m 36s
checks (PROFILEDIR=debug make -f Makefile build, 1.73.0, cargo)	1m 53s
checks (PROFILEDIR=debug make -f Makefile build-min, 1.73.0, cargo)	2m 36s
checks (PROFILEDIR=debug make -f Makefile build-no-ipc, 1.73.0, cargo)	1m 50s
checks_with_udev (RUST_LOG=stratisd=debug make -f Makefile test-loop, 1.73.0, cargo)	20m 3s
checks (PROFILEDIR=debug make -f Makefile stratis-dumpmetadata, 1.73.0, cargo)	2m 34s
checks (make -f Makefile docs-ci, 1.73.0, cargo)	1m 38s
checks (make -f Makefile test, 1.73.0, cargo)	2m 39s
checks (make -f Makefile build, 1.73.0, cargo)	3m 50s
checks (make -f Makefile build-min, 1.73.0, cargo)	3m 52s
checks (make -f Makefile build-no-ipc, 1.73.0, cargo)	2m 45s
	46m 16s

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