Fixup dependency on forked serde_xml (#21664) #649

Job	Run time
Build Rust (samples/client/petstore/rust/)	1m 10s
Build Rust (samples/client/others/rust/)	1m 28s
Build Rust (samples/server/petstore/rust-server/)	3m 53s
Build Rust (samples/server/petstore/rust-server-deprecated/)	4m 11s
Build Rust (samples/server/petstore/rust-axum/)	2m 56s
	13m 38s

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