fix(ci): group Dependabot updates into one PR per ecosystem #105

Job	Run time
governance / Check Workflow Staleness	9s
governance / Well-Known (RFC 9116 + RSR)	38s
governance / Security policy checks	44s
governance / Code quality + docs	36s
governance / Guix primary / Nix fallback policy	31s
governance / Language / package anti-pattern policy	42s
governance / Workflow security linter	37s
governance / Licence consistency	27s
governance / Trusted-base reduction policy	38s
governance / Validate Hypatia Baseline	-1s
	5m 1s

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