make static-analyse code

app/Models/WeightMeasure.php

@@ -4,6 +4,7 @@ namespace App\Models;
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /**
  * App\Models\WeightMeasure
@@ -33,7 +34,7 @@ class WeightMeasure extends Model
 
     protected $guarded = [];
 
-    public function user()
+    public function user(): BelongsTo
     {
         return $this->belongsTo(User::class);
     }