[4.2] Fix class name in uri test

[laoneo]

Pull Request for Issue #37606.

Summary of Changes

Adapts the class name of the uri test.

Testing Instructions

Run composer install

Actual result BEFORE applying this Pull Request

It shows the warning:
Class Joomla\Tests\Unit\Libraries\Cms\Uri\JUriTest located in ./tests/Unit/Libraries/Cms/Uri/UriTest.php does not comply with psr-4 autoloading standard. Skipping.

Expected result AFTER applying this Pull Request

Runs through.

[brianteeman]

I have tested this item ✅ successfully on fe1f0a0

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[alikon]

I have tested this item ✅ successfully on fe1f0a0

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37632.}

[alikon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37632.}

[roland-d]

Thanks everybody