Migrate PHPUnit to 9.6

Author: marc-mabe

composer.json

@@ -10,7 +10,7 @@
         "phpstan/phpstan": "^2.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.0"
+        "phpunit/phpunit": "^9.6"
     },
     "autoload": {
         "psr-4": {

phpunit.xml.dist

@@ -1,20 +1,18 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/7.0/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
          bootstrap="vendor/autoload.php">
-    <testsuites>
-        <testsuite name="Enum PHPStan Extension Unit Test Suite">
-            <directory>tests/unit</directory>
-        </testsuite>
-        <testsuite name="Enum PHPStan Extension Integration Test Suite">
-            <directory>tests/integration</directory>
-        </testsuite>
-    </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>src</directory>
-        </whitelist>
-    </filter>
+  <coverage>
+    <include>
+      <directory>src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="Enum PHPStan Extension Unit Test Suite">
+      <directory>tests/unit</directory>
+    </testsuite>
+    <testsuite name="Enum PHPStan Extension Integration Test Suite">
+      <directory>tests/integration</directory>
+    </testsuite>
+  </testsuites>
 </phpunit>