Update sdk lib

Author: olegisk

composer.json

@@ -25,7 +25,7 @@
     "php": ">=7.0",
     "ext-json": "*",
     "ext-bcmath": "*",
-    "swedbank-pay/swedbank-pay-sdk-php": "~5.3",
+    "swedbank-pay/swedbank-pay-sdk-php": "~5.4",
     "squizlabs/php_codesniffer": "^3.5"
   },
   "require-dev": {