test: php 8.4 (#4103)

* test: php 8.4

* fix: php 8.4 deprecations

* fix: make argument required

* chore: review changes

Author: SychO9

tests/phpunit.integration.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="../../../vendor/phpunit/phpunit/phpunit.xsd"
     backupGlobals="false"
     cacheDirectory=".phpunit.cache"
     backupStaticProperties="false"

tests/phpunit.unit.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="../../../vendor/phpunit/phpunit/phpunit.xsd"
     backupGlobals="false"
     cacheDirectory=".phpunit.cache"
     backupStaticProperties="false"