feat(DMD-987): add retry logic for 409 versionConflict responses

- Add retry handling for HTTP 409 responses with versionConflict error code
- Reuse existing exponential backoff mechanism for deadlock retries

Co-Authored-By: Martin Zajic <ja@mzajic.cz>

Author: devin-ai-integration[bot]

src/Keboola/StorageApi/HandlerStack.php

@@ -66,6 +66,9 @@ private static function createDefaultDecider(int $maxRetries, bool $retryOnMaint
 
             if ($retries >= $maxRetries) {
                 return false;
+            } elseif ($response && $response->getStatusCode() === 409) {
+                // Retry on 409 Conflict if it's a version conflict (deadlock) error
+                return self::isVersionConflictResponse($response);
             } elseif ($response && $response->getStatusCode() > 499) {
                 return true;
             } elseif ($error) {
@@ -76,6 +79,19 @@ private static function createDefaultDecider(int $maxRetries, bool $retryOnMaint
         };
     }
 
+    private static function isVersionConflictResponse(ResponseInterface $response): bool
+    {
+        $body = (string) $response->getBody();
+        $response->getBody()->rewind();
+
+        $data = json_decode($body, true);
+        if (!is_array($data)) {
+            return false;
+        }
+
+        return isset($data['code']) && $data['code'] === 'storage.components.configurations.versionConflict';
+    }
+
     private static function createExponentialDelay(): callable
     {
         return function ($retries) {