chore(deps): update rust crate serde to 1.0.228 #638

Job	Run time
ubuntu / stable / coverage	3m 29s
Build release binaries	2m 36s
Unit, docs and onhost integration tests	3m 33s
cargo fmt	15s
cargo doc	1m 50s
cargo shear (unused dependencies)	18s
tests as root	40s
Unit test for embedded downloader	24s
codespell	13s
cargo clippy	2m 10s
K8s integration tests (flux-self-update)	3m 38s
K8s integration tests (part2)	3m 41s
K8s integration tests (part1)	3m 40s
security / Rust audit scanner	2m 47s
build-widows-binary	3m 21s
⚖️ Check third party licenses	3m 29s
k8s-e2e-tests / K8s e2e tests infra	3m 45s
k8s-e2e-tests / K8s e2e tests	4s
🟢 All required checks and tests pass	5s
	39m 58s

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