chore: updated pub_updater dependency to latest

[OutdatedGuy]

Description

Updates the pub_updater package to latest i.e. ^0.4.0.

Follow up for PR https://github.com/invertase/flutterfire_cli/pull/273

Type of Change

• [ ] ✨ feat -- New feature (non-breaking change which adds functionality)
• [ ] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [ ] 📝 docs -- Documentation
• [x] 🗑️ chore -- Chore

[OutdatedGuy]

@russellwheatley, looks like melos version for flutterfire_cli_monorepo should be updated to use the latest pub_updater package.

What should we do?

1. [ ] Update melos along with pub_updater
2. [ ] Update melos first in a separate PR and then return here
3. [ ] Add range value to pub_updater dependency
4. [ ] Something else

[russellwheatley]

Closing out as dependencies have been updated here: https://github.com/invertase/flutterfire_cli/pull/287

Thanks for poking me into action to update dependencies 🙏