return support of guzzlehttp/guzzle ^6.3

Author: saintdron

composer.json

@@ -20,7 +20,7 @@
     "php": "^7.3 || ^8.0",
     "ext-dom": "*",
     "ext-mbstring": "*",
-    "guzzlehttp/guzzle": "^7.3",
+    "guzzlehttp/guzzle": "^6.3 || ^7.3",
     "guzzlehttp/psr7": "^1.5",
     "psr/http-message": "^1.0",
     "xparse/element-finder": "0.* || ^1.0.0",