Type hint all device model relations (#12686)

app/Models/MplsService.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use LibreNMS\Interfaces\Models\Keyable;
 
 class MplsService extends Model implements Keyable
@@ -45,7 +46,7 @@ class MplsService extends Model implements Keyable
 
     // ---- Define Relationships ----
 
-    public function binds()
+    public function binds(): HasMany
     {
         return $this->hasMany(\App\Models\MplsSdpBind::class, 'svc_id');
     }