Remove firebase/php-jwt require

It is no longer needed to target a specific version as google/auth now supports both 5.x and 6.x of firebase/php-jwt

Author: marickvantuil

composer.json

@@ -11,8 +11,7 @@
         "ext-json": "*",
         "phpseclib/phpseclib": "~2.0",
         "google/cloud-tasks": "^1.10",
-        "thecodingmachine/safe": "^1.0|^2.0",
-        "firebase/php-jwt": "^5.5||^6.0"
+        "thecodingmachine/safe": "^1.0|^2.0"
     },
     "require-dev": {
         "orchestra/testbench": "^4.0 || ^5.0 || ^6.0 || ^7.0",