Switch to cargo-audit for dependency checking. #493

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	5m 39s
build_attest_all (buildconfigs/oak_client_android_app.sh)	51m 34s
build_attest_all (buildconfigs/oak_containers_agent.sh)	6m 3s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	28m 44s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	8m 29s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	5m 57s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	9m 1s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	14m 28s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	17m 1s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	5m 21s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	4m 28s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	5m 8s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	5m 50s
build_attest_all (buildconfigs/oak_orchestrator.sh)	5m 40s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	18m 16s
build_attest_all (buildconfigs/stage0_bin.sh)	40m 46s
	3h 52m 25s

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