qa: update PHPUnit config to latest schema

- v9.3
- also adds result cache to ignore list

Signed-off-by: Matthew Weier O'Phinney <[email protected]>

Author: weierophinney

.gitignore

@@ -1,4 +1,5 @@
 /.phpcs-cache
+/.phpunit.result.cache
 /clover.xml
 /coveralls-upload.json
 /phpunit.xml

phpunit.xml.dist

@@ -1,13 +1,18 @@
-<phpunit bootstrap="./vendor/autoload.php" colors="true">
+<?xml version="1.0"?>
+<phpunit 
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    bootstrap="./vendor/autoload.php"
+    colors="true"
+    xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd">
+    <coverage processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">src</directory>
+        </include>
+    </coverage>
+
     <testsuites>
         <testsuite name="Mezzio Plates Tests">
             <directory>./test</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
 </phpunit>