Bump pnpm/action-setup to v4 #869

Job	Run time
Lint JS	17s
Slow tests: defaults with npm	1m 40s
Tests (addon-location)	37s
Tests: Type Check	12s
Slow tests: defaults with yarn	1m 23s
Tests (test-app-location)	39s
Slow tests: typescript with npm	2m 22s
Slow tests: defaults with pnpm	45s
Tests (addon-only)	29s
Slow tests: typescript with yarn	1m 34s
Tests (monorepo with npm)	1m 35s
Slow tests: typescript with pnpm	1m 10s
Tests (monorepo with yarn)	58s
Tests (monorepo with pnpm)	39s
Tests (rollup-build)	46s
Tests (declarations-configuration)	30s
	15m 36s

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