build(deps): bump serde from 1.0.208 to 1.0.209 #7920

Job	Run time
sequentialise	3s
fmt	1m 18s
parachain-dynamic-contract-test	19s
set-condition	7s
parachain-build-dev	43m 43s
bitacross-build	2m 53s
identity-build	2m 10s
parachain-clippy	14m 13s
parachain-runtime-test	26m 35s
parachain-unit-test	6m 18s
tee	24m 21s
bitacross	16m 44s
lit-sign-bitcoin	8m 7s
lit-di-substrate-identity-test	9m 50s
litentry	29m 28s
lit-di-evm-identity-test	7m 42s
lit-di-bitcoin-identity-multiworker-test	11m 21s
rococo	29m 47s
lit-di-bitcoin-identity-test	6m 29s
lit-di-evm-identity-multiworker-test	11m 53s
lit-di-solana-identity-test	8m 4s
lit-di-solana-identity-multiworker-test	11m 55s
lit-di-substrate-identity-multiworker-test	14m 48s
lit-di-vc-multiworker-test	21m 8s
lit-di-vc-test	16m 14s
lit-dr-vc-test	8m 35s
lit-parentchain-nonce	6m 40s
lit-dr-vc-multiworker-test	13m 26s
lit-test-failed-parentchain-extrinsic	7m 44s
lit-resume-worker	12m 39s
lit-twitter-identity-test	7m 36s
lit-discord-identity-test	6m 27s
lit-assertion-contracts-test	7m 28s
push-docker	0s
	6h 36m 5s

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