Source code for https://victorfont.com/remove-wordpress-script-query-strings/

_remove_script_version.php

<?php

//* Remove query strings from scripts
function _remove_script_version( $src ){
	$parts = explode( '?ver', $src );
	return $parts[0];
}
add_filter( 'script_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', '_remove_script_version', 15, 1 );

vmf_remove_script_version.php

<?php

function vmf_remove_script_version( $src ) {
    if ( strpos( $src, 'ver=' ) ) {
        $src = remove_query_arg( 'ver', $src );
    }
	return $src;
}
add_filter( 'script_loader_src', 'vmf_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', 'vmf_remove_script_version', 15, 1 );