[TASK] Use native types in ext:fluid_styled_content tests

This change adds a native type declaration for the
property `$contentFields` in `ContentVisibleFieldsTest`.

Resolves: #100149
Releases: main
Signed-off-by: Torben Hansen <derhansen@gmail.com>
Change-Id: I241d2051153f19b730bb0bbfeb404ab3c2873376
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78103


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>

typo3/sysext/fluid_styled_content/Tests/Functional/Tca/ContentVisibleFieldsTest.php

@@ -26,10 +26,7 @@ class ContentVisibleFieldsTest extends FunctionalTestCase
 {
     protected array $coreExtensionsToLoad = ['fluid_styled_content'];
 
-    /**
-     * @var array
-     */
-    protected static $contentFields = [
+    protected static array $contentFields = [
         'CType',
         'colPos',
         'sys_language_uid',