Bump syn from 1.0.98 to 2.0.48 #54

Job	Run time
set-image	1s
checks	1m 29s
bench-rust-nightly (bit-vec)	1m 45s
miri (bit-vec)	1m 49s
clippy	1m 19s
bench-rust-nightly (bytes)	1m 44s
miri (bytes)	1m 45s
bench-rust-nightly (generic-array)	1m 47s
tests	1m 22s
miri (generic-array)	1m 47s
bench-rust-nightly (derive)	1m 40s
bench-rust-nightly (max-encoded-len)	1m 46s
miri (arbitrary)	1m 43s
build-linux-ubuntu-amd64	0s
publish-dry-run	0s
	19m 57s

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