fix: migrate vendor rustfmt.toml to stable-only features

- Update vendor/pezkuwi-zombienet-sdk/rustfmt.toml to stable-only
- Reformat 74 vendor files with stable rustfmt
- Remove nightly-only features causing CI failures

vendor/pezkuwi-zombienet-sdk/crates/orchestrator/src/utils.rs

@@ -2,7 +2,7 @@ use serde::Deserializer;
 
 pub fn default_as_empty_vec<'de, D, T>(_deserializer: D) -> Result<Vec<T>, D::Error>
 where
-    D: Deserializer<'de>,
+	D: Deserializer<'de>,
 {
-    Ok(Vec::new())
+	Ok(Vec::new())
 }