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ci: add timeout-minutes to the 4 reusable-workflow jobs that lacked it #582

Job	Run time
governance / Security policy checks	7s
governance / Check Workflow Staleness	10s
governance / Code quality + docs	19s
governance / Well-Known (RFC 9116 + RSR)	6s
governance / Licence consistency	8s
governance / Language / package anti-pattern policy	14s
governance / Workflow security linter	6s
governance / Guix primary / Nix fallback policy	5s
governance / Trusted-base reduction policy	7s
governance / Validate Hypatia Baseline	-1s
	1m 21s