Update Actions

[GroovinChip]

• Use checkout v3 and flutter v2
• Use code metrics action
• Use codecov v3

[github-actions[bot]]

Dart Code Metrics analyze report of macos_ui. ✅

Summary

• Scanned folders: lib

• Total scanned files: 67

• Total lines of source code: 8399

• Total classes: 171

• Average Cyclomatic Number per line of code: 0.25 / 6

• Average Source Lines of Code per method: 11

• Total tech debt: not found

• Found issues: 0 ✅