Merge branch '5.0' into 5.1

* 5.0:
  [PhpUnitBridge] fix leftover
  [PhpUnitBridge] fix installing under PHP >= 8
  Use ">=" for the "php" requirement
  bump icu 67.1

Author: nicolas-grekas

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": "^7.2.5",
+        "php": ">=7.2.5",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/polyfill-php80": "^1.15"
     },