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ci: bump syn from 2.0.118 to 3.0.2 #471

Job	Run time
test-miri (x86_64-unknown-linux-gnu)	56s
test-careful	1m 14s
test-miri (s390x-unknown-linux-gnu)	1m 12s
test (1.85.0)	1m 33s
build (stable, thumbv7em-none-eabi)	15s
test (stable)	1m 39s
build (stable, wasm32-unknown-unknown)	16s
build (1.85.0, wasm32-unknown-unknown)	17s
minimal-versions / minimal-versions	27s
build (1.85.0, thumbv7em-none-eabi)	13s
	8m 2s