fix: function() is made private

[Daanvdplas]

In the following PR the nodes() function is replaced under the ChainUpgrade trait and made private. There is now no way to obtain this information for external crates.

For parachains it is still possible:

zombienet-sdk/crates/orchestrator/src/network/parachain.rs

Line 194 in 0ac8f6f

pub fn collators(&self) -> Vec<&NetworkNode> {

[pepoviola]

Hi @Daanvdplas, thanks for report it. I will make the fn public and craft another release. Sorry about the issue.

Thanks!