Bump pnpm/action-setup from 6.0.3 to 6.0.5 #16878

Job	Run time
Verify Jekyll website builds	8s
lint_node	33s
build_node (windows-latest)	3m 54s
lint_ruby	22s
build_node (macos-latest)	2m 50s
build_node (ubuntu-latest)	2m 24s
Ruby 3.4 on macos-latest	4m 22s
Ruby 3.3 on ubuntu-latest	8m 58s
Ruby 3.4 on windows-latest	19m 18s
Ruby 4.0 on macos-latest	6m 46s
Ruby 3.3 on macos-latest	5m 13s
Ruby 3.4 on ubuntu-latest	8m 41s
Ruby 4.0 on ubuntu-latest	7m 7s
Ruby 3.3 on windows-latest	20m 28s
Ruby 4.0 on windows-latest	18m 47s
	1h 49m 51s

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