Cleanup: Reformat phpunit.xml + Remove redundant coverage tag

Author: pH-7

phpunit.xml.dist

@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="vendor/autoload.php" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.2/phpunit.xsd" cacheDirectory=".phpunit.cache">
-  <coverage/>
-  <testsuites>
+<phpunit 
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/|version|/phpunit.xsd"
+    bootstrap="vendor/autoload.php"
+    colors="true"
+    cacheDirectory=".phpunit.cache">  
+<testsuites>
     <testsuite name="Unit Tests">
       <directory>tests</directory>
     </testsuite>