[TASK] Add todo for strictly typing class UnableToLinkException

The constructor of UnableToLinkException should be strictly
typed, since the method getLinkText() is strictly typed.
Also make the variable declaration of $linkText strictly typed.
It will throw an error if $linkText isn't a string.
Added a todo for TYPO3 v13.

Resolves: #100119
Related: #100106
Releases: main
Change-Id: Ifbb9a3f5b4aa1fd1588eb0596731377f41bc5ffd
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78072


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>

typo3/sysext/frontend/Classes/Typolink/UnableToLinkException.php

@@ -26,6 +26,7 @@ class UnableToLinkException extends Exception
 {
     /**
      * @var string the text which should have gone inside the
+     * @todo Make $linkText strictly typed in TYPO3 v13
      */
     protected $linkText;
 
@@ -36,6 +37,7 @@ class UnableToLinkException extends Exception
      * @param int $code [optional] The Exception code.
      * @param \Throwable $previous [optional] The previous throwable used for the exception chaining.
      * @param string $linkText [optional]
+     * @todo Make the signature strictly typed in TYPO3 v13
      */
     public function __construct($message = '', $code = 0, \Throwable $previous = null, $linkText = '')
     {