ci: setup dependency firewall

[staaldraad]

What kind of change does this PR introduce?

CI update

What is the new behavior?

Uses Dependency Firewall from DepthFirst: https://depthfirst.com/dependency-firewall

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit:92314f308c

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• Open a pull request for review
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[github-actions]

Supabase CLI preview

npx --yes https://pkg.pr.new/supabase/cli/supabase@e043f55b18c3118249ed5bf02a9c6b47e352d07d

Preview package for commit e043f55.