Use explicit void operator for side-effect expression in multiaddr conversion

[Copilot]

The multiaddrToSocketAddress function uses multiaddr.bytes solely for its getter side-effect (cache population). This pattern is flagged by Biome as an unused expression.

Changes:

• Replace multiaddr.bytes; with void multiaddr.bytes in packages/discv5/src/util/ip.ts
• Update comment to clarify intent

export function multiaddrToSocketAddress(multiaddr: Multiaddr): SocketAddress {
  let ip: Ip | undefined;
  let port: number | undefined;
  // Force cache population of bytes property to ensure getComponents() works correctly
  void multiaddr.bytes;
  for (const component of multiaddr.getComponents()) {
    // ...
  }
}

This pattern is consistent with the approach used in packages/enr/src/enr.ts.

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