Bump proc-macro2 from 1.0.78 to 1.0.79 in /lang/rust #2596

Job	Run time
interop	6m 23s
web-assembly	3m 13s
ci (stable, x86_64-unknown-linux-gnu)	5m 56s
ci (stable, wasm32-unknown-unknown)	3m 10s
ci (beta, x86_64-unknown-linux-gnu)	4m 48s
ci (beta, wasm32-unknown-unknown)	3m 18s
ci (nightly, x86_64-unknown-linux-gnu)	5m 23s
ci (nightly, wasm32-unknown-unknown)	3m 36s
ci (1.70.0, x86_64-unknown-linux-gnu)	5m 43s
ci (1.70.0, wasm32-unknown-unknown)	3m 27s
	44m 57s

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