Fix deprecated XML configuration schema

phpunit.xml

@@ -9,20 +9,20 @@
             <directory suffix="Test.php">./tests/Feature</directory>
         </testsuite>
     </testsuites>
-    <coverage processUncoveredFiles="true">
+    <coverage>
         <include>
             <directory suffix=".php">./app</directory>
         </include>
     </coverage>
     <php>
-        <server name="APP_ENV" value="testing"/>
-        <server name="BCRYPT_ROUNDS" value="4"/>
-        <server name="CACHE_DRIVER" value="array"/>
-        <server name="DB_CONNECTION" value="sqlite"/>
-        <server name="DB_DATABASE" value=":memory:"/>
-        <server name="MAIL_MAILER" value="array"/>
-        <server name="QUEUE_CONNECTION" value="sync"/>
-        <server name="SESSION_DRIVER" value="array"/>
-        <server name="TELESCOPE_ENABLED" value="false"/>
+        <env name="APP_ENV" value="testing"/>
+        <env name="BCRYPT_ROUNDS" value="4"/>
+        <env name="CACHE_DRIVER" value="array"/>
+        <env name="DB_CONNECTION" value="sqlite"/>
+        <env name="DB_DATABASE" value=":memory:"/>
+        <env name="MAIL_MAILER" value="array"/>
+        <env name="QUEUE_CONNECTION" value="sync"/>
+        <env name="SESSION_DRIVER" value="array"/>
+        <env name="TELESCOPE_ENABLED" value="false"/>
     </php>
 </phpunit>