v4.9.4

What's Changed

• [Scheduled] dart pub upgrade --null-safety by @myConsciousness in #654
• [Scheduled] dart pub upgrade --null-safety by @myConsciousness in #655
• [Scheduled] dart pub upgrade --null-safety by @myConsciousness in #656
• fix: fixed for the issue (#657) by @myConsciousness in #658

Full Changelog: v4.9.3...v4.9.4