Bump proc-macro2 from 1.0.70 to 1.0.71 #217

Job	Run time
set-image	1s
clippy	9m 56s
clippy-examples (STD)	10m 22s
check (STD)	8m 9s
dylint	4m 2s
clippy-examples (WASM)	3m 34s
check (WASM)	1m 48s
fmt	2m 9s
check (RISCV)	1m 47s
spellcheck	1m 16s
test	15m 24s
build (STD)	13m 36s
build (WASM)	1m 43s
examples-test	21m 48s
docs	8m 40s
codecov	22m 43s
examples-contract-build (WASM)	16m 33s
examples-docs	4m 11s
examples-contract-build (RISCV)	3m 8s
fuzz	0s
measurements / contract-sizes	24m 34s
	2h 55m 24s

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