Update Rust crate serde to 1.0.204 #1133

Job	Run time
Cross-compile to aarch64	1m 39s
Build and test core crates (ubuntu-latest, 1.75)	1m 52s
Build and test (all features) (ubuntu-latest, 1.75)	3m 8s
Build and test core crates (ubuntu-latest, stable)	1m 53s
Build and test (all features) (ubuntu-latest, stable)	3m 0s
Build and test core crates (macos-14, 1.75)	1m 55s
Build and test (all features) (macos-14, 1.75)	2m 39s
Build and test core crates (macos-14, stable)	1m 45s
Build and test (all features) (macos-14, stable)	3m 8s
Build and test core crates (windows-latest, 1.75)	5m 10s
Build and test (all features) (windows-latest, 1.75)	7m 14s
Build and test core crates (windows-latest, stable)	5m 33s
Build and test (all features) (windows-latest, stable)	6m 24s
Build documentation (ubuntu-latest)	1m 2s
Lint	1m 8s
cargo-compare extended tests (ubuntu-latest)	2m 58s
cargo-compare extended tests (macos-14)	2m 56s
	53m 24s

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