fix(react-router): preserve element types in SSR dedupe helper

[grzdev]

Summary

The dedupe helper in packages/react-router/lib/dom/ssr/components.tsx
currently accepts any[], which erases element types for downstream callers.

This change makes dedupe generic so it preserves the array element type
while keeping the same runtime behavior.

Changes

• change dedupe(array: any[]) to dedupe<T>(array: readonly T[]): T[]

Verification

• pnpm typecheck

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Latest commit: 6e41f4c

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