Resolve TODO in core/src/p2p/manager.rs

[Julian Braha]

Describe the bug

I found this TODO in core/src/p2p/manager.rs:

// TODO: Make private
pub quic: QuicTransport,

But this field isn't actually accessed outside of manager.rs anyway

Reproduction

No response

Expected behavior

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Platform and versions

8.14.1
cargo 1.76.0 (c84b36747 2024-01-18)
rustc 1.76.0 (07dca489a 2024-02-04)

Stack trace

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Additional context

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