refactor(ci): consolidate dependency update workflows into update-deps

[ayushb89]

Consolidates the separate dependency auto-update workflows into a single centralized update-deps.yaml workflow.

This reduces duplicated setup logic by using a shared matrix-based flow for platform updates while preserving existing schedules, permissions, concurrency handling, and PR behavior.

Builder and python updates remain separate jobs due to their specific environment/setup requirements.

Closes #3291

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[knative-prow]

Welcome @ayushb89! It looks like this is your first PR to knative/func 🎉

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