Bump syn from 2.0.77 to 2.0.79 in the known_good_semver group (#5864) #1

Job	Run time
preflight / preflight	10s
preflight / ci-versions	1m 0s
test-full-crypto-feature	1s
test-frame-ui	1s
cargo-check-benches	0s
test-node-metrics	1s
cargo-check-each-crate (1)	1s
cargo-check-all-crate-macos	1s
cargo-check-each-crate (2)	1s
cargo-check-each-crate (3)	1s
cargo-check-each-crate (4)	1s
cargo-check-each-crate (5)	1s
cargo-check-each-crate (6)	1s
cargo-check-each-crate (7)	1s
node-bench-regression-guard	5s
test-frame-examples-compile-to-wasm	0s
check-tracing	0s
test-deterministic-wasm	0s
check-metadata-hash	0s
All test misc tests passed	1s
	1m 27s

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