Update proc-macro2 in gn (#5853) #2558

Job	Run time
Check Credentials for jobs that need JSON credentials	9s
WASM Demo	1m 34s
bench-binsize	2m 29s
bench-memory (macos-latest)	3m 12s
bench-memory (ubuntu-latest)	3m 25s
bench-memory (windows-latest)	8m 33s
bench-perf (components/collections)	4m 38s
bench-perf (components/datetime)	46s
bench-perf (components/locale)	2m 39s
bench-perf (components/locale_core)	5m 22s
bench-perf (components/plurals)	6m 10s
bench-perf (components/segmenter)	3m 49s
bench-perf (provider/blob)	2m 28s
bench-perf (utils/fixed_decimal)	5m 57s
bench-perf (utils/litemap)	2m 7s
bench-perf (utils/tinystr)	6m 39s
bench-perf (utils/writeable)	3m 56s
bench-perf (utils/zerotrie)	5m 15s
bench-perf (utils/zerovec)	8m 58s
Rust docs	4m 46s
Dart docs	1m 19s
C++ docs	39s
TypeScript docs	42s
Deploy to GitHub Pages	8m 25s
	1h 33m 57s

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