build(deps): bump serde from 1.0.204 to 1.0.208 #721

Job	Run time
check	1m 19s
cargo-test-sbf (token/program)	1m 22s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	1m 28s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	1m 35s
cargo-test-sbf (token-upgrade/program)	1m 35s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	3m 0s
cargo-test-sbf (feature-proposal/program)	1m 35s
test (single-pool/cli, single-pool/program)	2m 47s
cargo-test-sbf (governance/addin-mock/program, governance/program)	1m 24s
test (token-upgrade/cli, token-upgrade/program)	3m 5s
cargo-test-sbf (memo/program)	1m 23s
cargo-test-sbf (name-service/program)	1m 18s
cargo-test-sbf (stake-pool/program)	1m 23s
cargo-test-sbf (single-pool/program)	1m 32s
	24m 46s

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