fix: allow attribute server.port as a return type integer

Author: DominicDetta

src/Instrumentation/Doctrine/src/AttributesResolver.php

@@ -41,7 +41,7 @@ final class AttributesResolver
         'trino',
     ];
 
-    public static function get(string $attributeName, array $params): string
+    public static function get(string $attributeName, array $params)
     {
         $method = 'get' . str_replace('.', '', ucwords($attributeName, '.'));
 
@@ -63,9 +63,9 @@ private static function getServerAddress(array $params): string
     /**
      * Resolve attribute `server.port`
      */
-    private static function getServerPort(array $params): string
+    private static function getServerPort(array $params): int
     {
-        return $params[1][0]['port'] ?? 'unknown';
+        return (int)($params[1][0]['port'] ?? null);
     }
 
     /**