Test

chore: bump flatted from 3.2.9 to 3.4.2 #4993

Job	Run time
Check	6s
Coverage	4m 8s
Features	18s
Loader	24s
Bootstrap (release)	4m 53s
Bootstrap (debug)	4m 5s
Runtimes	32s
Compiler (windows, node current)	1m 50s
Compiler (macos, node current)	1m 18s
Compiler (macos, node lts/*)	1m 10s
Compiler (ubuntu, node lts/*)	1m 45s
Compiler (ubuntu, node current)	1m 44s
Compiler (windows, node lts/*)	1m 57s
	24m 10s

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