Use >= operator instead of ^ operator for PHP version constraint

Author: sebastianbergmann

ChangeLog-8.5.md

@@ -4,6 +4,10 @@ All notable changes of the PHPUnit 8.5 release series are documented in this fil
 
 ## [8.5.12] - 2020-MM-DD
 
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.2` to `>=7.2`
+
 ### Fixed
 
 * [#4529](https://github.com/sebastianbergmann/phpunit/issues/4529): Debug mode of Xdebug 2 is not disabled for PHPT tests

composer.json

@@ -21,7 +21,7 @@
     },
     "prefer-stable": true,
     "require": {
-        "php": "^7.2",
+        "php": ">=7.2",
         "ext-dom": "*",
         "ext-json": "*",
         "ext-libxml": "*",