Change the size calculation method

I created a code that allows me to calculate the longest or widest or tallest object. I need this to determine that the product does not exceed certain dimensions that the courier imposes for the various shipping classes. In this way I managed to solve the problem but with each update there is a risk that the file will be overwritten and therefore it will not work. Can you insert a hook or another way to modify these functions from the child theme? Thank you
file class-conditional-shipping-filters.php
code:
/**
* Calculate cart height
*/
private static function calculate_package_height($package) {
//$total = 0;
$highestValue = 0;

foreach ( $package[‘contents’] as $key => $data ) {
$product = $data[‘data’];

if ( ! $product->needs_shipping() || ! $product->has_dimensions() ) {
continue;
}

$item_height = $product->get_height();

if ( $item_height ) {
if($item_height > $highestValue){
$highestValue = $item_height;
}
//$total += floatval( $item_height ) * $data[‘quantity’];
}
}

return $highestValue;
//return $total;
}

/**
* Calculate cart length
*/
private static function calculate_package_length($package) {
//$total = 0;
$highestValue = 0;

foreach ( $package[‘contents’] as $key => $data ) {
$product = $data[‘data’];

if ( ! $product->needs_shipping() || ! $product->has_dimensions() ) {
continue;
}

$item_length = $product->get_length();

if ( $item_length ) {
if($item_length > $highestValue){
$highestValue = $item_length;
}
//$total += floatval( $item_length ) * $data[‘quantity’];
}
}

return $highestValue;
//return $total;
}

/**
* Calculate cart width
*/
private static function calculate_package_width($package) {
//$total = 0;
$highestValue = 0;

foreach ( $package[‘contents’] as $key => $data ) {
$product = $data[‘data’];

if ( ! $product->needs_shipping() || ! $product->has_dimensions() ) {
continue;
}

$item_width = $product->get_width();

if ( $item_width ) {
if($item_width > $highestValue){
$highestValue = $item_width;
}
//$total += floatval( $item_width ) * $data[‘quantity’];
}
}

return $highestValue;
//return $total;
}