Creation of dynamic property Diff_SequenceMatcher.... is deprecated in php8+

[a4992214]

<b>Deprecated</b>
:  Creation of dynamic property Diff_SequenceMatcher::$matchingBlocks is deprecated in <b>....\vendor\php-diff-master\lib\Diff\SequenceMatcher.php</b>
on line <b>129</b>
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<b>Deprecated</b>
:  Creation of dynamic property Diff_SequenceMatcher::$opCodes is deprecated in <b>....\vendor\php-diff-master\lib\Diff\SequenceMatcher.php</b>
on line <b>130</b>
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<b>Deprecated</b>
:  Creation of dynamic property Diff_SequenceMatcher::$fullBCount is deprecated in <b>....\vendor\php-diff-master\lib\Diff\SequenceMatcher.php</b>
on line <b>151</b>

Fix: Add the following lines to the start of the class:

class Diff_SequenceMatcher
{
    private ?array $matchingBlocks = null; // NEW
    private ?array $opCodes = null; // NEW
    private ?array $fullBCount = null; // NEW