Bump proc-macro2 from 1.0.66 to 1.0.67 in /lang/rust #2015

Job	Run time
interop	8m 29s
ci (stable, x86_64-unknown-linux-gnu)	5m 18s
ci (stable, wasm32-unknown-unknown)	2m 18s
web-assembly	1m 33s
ci (beta, x86_64-unknown-linux-gnu)	4m 58s
ci (beta, wasm32-unknown-unknown)	2m 22s
ci (nightly, x86_64-unknown-linux-gnu)	5m 12s
ci (nightly, wasm32-unknown-unknown)	1m 59s
ci (1.65.0, x86_64-unknown-linux-gnu)	9m 2s
ci (1.65.0, wasm32-unknown-unknown)	4m 57s
	46m 8s

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