Remove obsolete symfony/polyfill-php80

Author: OskarStark

composer.json

@@ -16,7 +16,6 @@
         "ext-mongodb": "^1.21.0",
         "composer-runtime-api": "^2.0",
         "psr/log": "^1.1.4|^2|^3",
-        "symfony/polyfill-php80": "^1.27",
         "symfony/polyfill-php81": "^1.27"
     },
     "require-dev": {