Bump proc-macro2 from 1.0.87 to 1.0.88 (#636) #212

Job	Run time
set-image	1s
fmt	1m 18s
tests	3m 47s
checks	1m 29s
bench-rust-nightly (bit-vec)	18m 18s
clippy	1m 56s
miri (bit-vec)	5h 40m 22s
bench-rust-nightly (bytes)	17m 1s
bench-rust-nightly (generic-array)	17m 3s
miri (bytes)	3m 24s
miri (generic-array)	3m 16s
bench-rust-nightly (derive)	17m 8s
bench-rust-nightly (max-encoded-len)	17m 13s
miri (arbitrary)	3m 17s
build-linux-ubuntu-amd64	1m 21s
publish-dry-run	1m 10s
	7h 28m 4s

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