chore(deps-dev): bump flatted from 3.4.1 to 3.4.2 (#4714) #10600

Job	Run time
Lint (ubuntu-latest, lts/*, latest)	40s
Smoketests (ubuntu-latest, lts/*)	1m 14s
Test - macos-latest - Node v20.x, Webpack latest, DevServer latest	2m 59s
Test - ubuntu-latest - Node v22.x, Webpack latest, DevServer latest	2m 53s
Test - windows-latest - Node v22.x, Webpack latest, DevServer latest	2m 49s
Test - ubuntu-latest - Node v20.x, Webpack latest, DevServer latest	2m 51s
Test - ubuntu-latest - Node v25.x, Webpack latest, DevServer latest	2m 51s
Test - windows-latest - Node v25.x, Webpack latest, DevServer latest	2m 49s
Test - macos-latest - Node v22.x, Webpack latest, DevServer latest	3m 7s
Test - windows-latest - Node v20.x, Webpack latest, DevServer latest	2m 48s
Test - macos-latest - Node v25.x, Webpack latest, DevServer latest	2m 59s
Test - ubuntu-latest - Node v24.x, Webpack latest, DevServer latest	2m 54s
Test - windows-latest - Node v24.x, Webpack latest, DevServer latest	2m 50s
Test - macos-latest - Node v24.x, Webpack latest, DevServer latest	2m 56s
	36m 40s

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