fix: Invalid XML response

[neznaika0]

Description
I don't understand why this is not detected on github, but there is a bug in the local environment.
Perhaps the cache is interfering here
Replace to <false></false>:

1) CodeIgniter\Test\FeatureTestTraitTest::testSetupRequestBodyWithXml
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
 '<?xml version="1.0"?>
-<response><true>1</true><false/><int>2</int><null/><float>1.23</float><string>foo</string></response>
+<response><true>1</true><false></false><int>2</int><null></null><float>1.23</float><string>foo</string></response>
 '

[kenjis]

See https://github.com/codeigniter4/CodeIgniter4/actions/runs/10860683361/job/30141629888?pr=9191

[kenjis]

<false/> is correct.

[kenjis]

Your library linked to PHP (libxml) is old?

[neznaika0]

Maybe. I am using Debian Testing, php 8.3.9
My tests are not running on the local PC. I wanted to correct it. Apparently, you will never achieve the perfect environment (without docker)