Remove PHPUnit functions polyfill (#1395)

Author: GromNaN

composer.json

@@ -23,7 +23,7 @@
         "doctrine/coding-standard": "^12.0",
         "rector/rector": "^1.1",
         "squizlabs/php_codesniffer": "^3.7",
-        "symfony/phpunit-bridge": "^5.2",
+        "symfony/phpunit-bridge": "^7.1",
         "vimeo/psalm": "^5.13"
     },
     "replace": {
@@ -36,8 +36,7 @@
     "autoload-dev": {
         "psr-4": {
             "MongoDB\\Tests\\": "tests/"
-        },
-        "files": [ "tests/PHPUnit/Functions.php" ]
+        }
     },
     "scripts": {
         "bench": "cd benchmark && composer update && vendor/bin/phpbench run --report=aggregate",