Dropped PHPUnit 8

Author: GrahamCampbell

phpunit.xml.dist

@@ -5,6 +5,7 @@
          beStrictAboutOutputDuringTests="true"
          bootstrap="vendor/autoload.php"
          colors="true"
+         convertDeprecationsToExceptions="true"
          convertErrorsToExceptions="true"
          convertNoticesToExceptions="true"
          convertWarningsToExceptions="true"

vendor-bin/phpunit/composer.json

@@ -1,7 +1,7 @@
 {
     "require": {
         "php": "^7.4.15 || ^8.0.2",
-        "phpunit/phpunit": "^8.5.23 || ^9.5.12"
+        "phpunit/phpunit": "^9.5.12"
     },
     "config": {
         "preferred-install": "dist"