chore(deps): bump git2 from 0.20.4 to 0.21.0 in /robot-repo-automaton #52

Job	Run time
governance / Well-Known (RFC 9116 + RSR)	4s
governance / Security policy checks	6s
governance / Workflow security linter	5s
governance / Code quality + docs	14s
governance / Guix primary / Nix fallback policy	4s
governance / Language / package anti-pattern policy	6s
	39s

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