Bump phpunit 8 to 9

composer.json

@@ -1,10 +1,7 @@
 {
      "name": "bear/streamer",
      "description": "BEAR.Sunday HTTP stream responder",
-     "keywords": [
-          "BEAR",
-          "stream"
-     ],
+     "keywords": ["BEAR", "stream"],
      "license": "MIT",
      "authors": [
           {
@@ -35,7 +32,7 @@
           "ray/di": "^2.11"
      },
      "require-dev": {
-          "phpunit/phpunit": "^8.5",
+          "phpunit/phpunit": "^9.5",
           "doctrine/annotations": "^1.7",
           "bamarni/composer-bin-plugin": "^1.4"
      },

phpunit.xml.dist

@@ -1,18 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
-         bootstrap="vendor/autoload.php">
-    <testsuites>
-        <testsuite name="all">
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
-    <php>
-        <ini name="error_reporting" value="-1" />
-    </php>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" bootstrap="vendor/autoload.php">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="all">
+      <directory>tests</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <ini name="error_reporting" value="-1"/>
+  </php>
 </phpunit>