Modernize codebase

[morr0ne]

This PR modernizes the codebase with several key improvements:

• Removed outdated Rust actions (rustup is now included in GitHub Actions)
• Implemented nextest as test runner for significantly improved speed and industry best practices
• Updated all actions to their latest versions
• Fixed all clippy lints
• Updated dependencies to latest versions
• Resolved code compatibility issues with newer dependencies (notably, lua no longer requires lifetimes)
• Fixed workspace lock file issues (previously duplicated and not properly utilized)

Note: While the main CI workflow changes are reliable, the release workflow has been updated but not fully tested. I considered removing these somewhat unreliable release workflows entirely but opted to update them for now.