minor #522 Remove polyfill (derrabus)

This PR was merged into the 2.0.x-dev branch.

Discussion
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Remove polyfill

On the main branch, we require PHP 8 or higher. I think, it's therefor safe to remove the PHP 7.2 polyfill.

Commits
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4651d8c Remove polyfill

Author: chalasr

composer.json

@@ -27,7 +27,6 @@
     "symfony/dom-crawler": "^4.4 || ^5.0 || ^6.0",
     "symfony/http-client": "^4.4.11 || ^5.2 || ^6.0",
     "symfony/http-kernel": "^4.4 || ^5.0 || ^6.0",
-    "symfony/polyfill-php72": "^1.9",
     "symfony/process": "^4.4 || ^5.0 || ^6.0"
   },
   "autoload": {