Bump pnpm/action-setup to v4 #867

Job	Run time
Tests: Type Check	21s
Lint JS	21s
Slow tests: defaults with npm	1m 52s
Tests (addon-location)	44s
Slow tests: defaults with yarn	1m 19s
Tests (test-app-location)	45s
Slow tests: typescript with npm	2m 30s
Slow tests: defaults with pnpm	52s
Tests (addon-only)	29s
Slow tests: typescript with yarn	1m 37s
Tests (monorepo with npm)	2m 56s
Slow tests: typescript with pnpm	1m 8s
Tests (monorepo with yarn)	1m 6s
Tests (monorepo with pnpm)	54s
Tests (rollup-build)	52s
Tests (declarations-configuration)	31s
	18m 17s

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