Remove unnecessary line of code

src/App/Services/AdaUsdQuoteService.php

@@ -17,8 +17,6 @@ class AdaUsdQuoteService
 {
     public $rate;
 
-    public array $rateApiProviders = ['coinapi', 'coinbase', 'coinmarketcap'];
-
     public array $ratesArray = [];
 
     public function __construct(protected CurrencyEnum|null $base = null, protected CurrencyEnum|null $quote = null)