The rand 0.9 upgrade introduced a rand_core version mismatch: rand 0.9 uses rand_core 0.9, while ed25519-dalek 2.2.0 requires rand_core 0.6. This caused trait incompatibility errors when generating signing keys.

Changes

• Add rand_core 0.6 as optional dependency with getrandom feature
• Replace rand::thread_rng() with rand_core::OsRng in container.rs
• Update testcontainer feature to include dep:rand_core

This maintains compatibility with both rand 0.9 and ed25519-dalek's rand_core 0.6 requirement.

// Before
use rand::prelude::ThreadRng;
let mut rng: ThreadRng = rand::thread_rng();
self.signing_key = Some(SigningKey::generate(&mut rng));

// After
use rand_core::OsRng;
self.signing_key = Some(SigningKey::generate(&mut OsRng));

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