PHP Fatal error: Array and string offset access syntax with curly braces

Hello, I’m using PHP 8.2 and getting the fatal error, pasted below.

PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in wp-content/plugins//wp-optimize/vendor/marcusschwarz/lesserphp/lessify.inc.php on line 57

if (!$eatWhitespace and strlen($what) == 1) {
	if ($this->buffer{$this->count} == $what) {
		$this->count++;
		return true;
	}
	else return false;
}

Thanks!
Jhaun