Rust

Update version to v0.2.4-dev. #2544

Job	Run time
licenses	9s
bazel	5m 40s
audit	2m 49s
stable	35s
msrv	3m 17s
nightly	57s
reactors (hello_world)	25s
reactors (http_headers)	26s
reactors (http_body)	25s
reactors (http_config)	26s
reactors (grpc_auth_random)	25s
examples (http_auth_random)	29s
outdated	5m 10s
reactors (envoy_filter_metadata)	25s
examples (http_config)	16s
reactors (http_auth_random)	26s
examples (hello_world)	17s
examples (http_body)	16s
examples (grpc_auth_random)	13s
examples (envoy_filter_metadata)	31s
examples (http_headers)	16s
	23m 53s

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