chore: Update filament/filament version requirement to support Filament 5

[zoispag]

Summary

• Updates filament/filament dependency constraint from ^4.0 to ^4.0|^5.0
• Enables compatibility with both Filament v4 and v5

Background

Filament v5 was released on January 16, 2026. According to the official release announcement:

"Apart from Livewire v4 support, Filament v5 has no additional changes over v4"

The version bump exists primarily to support Livewire v4.0+, with no breaking changes to the core APIs that this package uses (ScalableIcon interface, IconSize enum).

Testing

• Validated composer.json syntax with composer validate
• Verified that the APIs used by this package (Filament\Support\Contracts\ScalableIcon, Filament\Support\Enums\IconSize) remain unchanged in v5

Impact

• Filament v4 users (Laravel 10+): No changes, can continue using the package
• Filament v5 users (Laravel 11.28+): Can now install and use this package with Filament v5

This allows users to upgrade to Filament v5 at their own pace without being blocked by package compatibility.