build(deps): bump syn from 2.0.39 to 2.0.40 #4728

Job	Run time
check	0s
cargo-test-sbf (token/program)	10m 19s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 44s
cargo-test-sbf (token-upgrade/program)	9m 38s
cargo-test-sbf (feature-proposal/program)	9m 25s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 1s
cargo-test-sbf (memo/program)	10m 13s
cargo-test-sbf (name-service/program)	8m 40s
cargo-test-sbf (stake-pool/program)	11m 59s
cargo-test-sbf (single-pool/program)	11m 14s
test	0s
	1h 52m 13s

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