Bump syn from 2.0.87 to 2.0.89 #277

Job	Run time
set-image	1s
checks	1m 18s
fmt	1m 4s
clippy	1m 29s
bench-rust-nightly (bit-vec)	18m 17s
bench-rust-nightly (bytes)	17m 12s
miri (bit-vec)	3h 48m 32s
tests	3m 50s
bench-rust-nightly (generic-array)	17m 21s
miri (bytes)	4m 1s
bench-rust-nightly (derive)	17m 15s
miri (generic-array)	3m 40s
bench-rust-nightly (max-encoded-len)	17m 24s
miri (arbitrary)	3m 44s
build-linux-ubuntu-amd64	1m 17s
publish-dry-run	1m 24s
	5h 37m 49s

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