Bump pnpm/action-setup from 4 to 6 #962

Job	Run time
Web tests (browser matrix) (chromium)	1m 26s
Web tests (browser matrix) (webkit)	1m 22s
Desktop (Electron) tests (windows-latest, Windows)	1m 30s
Web tests (browser matrix) (firefox)	1m 6s
Desktop (Electron) tests (macos-latest, macOS)	47s
Desktop (Electron) tests (ubuntu-latest, Linux)	1m 6s
	7m 17s

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