J4 Helix 3 Php8 Gives Error: array_replace(): Argument #2 () Must Be Of Type Array, String Given

Bug description

helix3.php uses wrong arguments for addStyleSheet() in Line 642 and 648.

Helix3/plugins/system/helix3/core/helix3.php

Line 642 in e4b01f3

self::getInstance()->document->addStyleSheet(JURI::base(true) . '/templates/' . $template . '/css/' . $src, 'text/css', null, $attribs);

Helix3/plugins/system/helix3/core/helix3.php

Line 648 in e4b01f3

self::getInstance()->document->addStyleSheet($src, 'text/css', null, $attribs);

With PHP7.x and Joomla3 this does not impact anything, but if the user upgrades to Joomla4 and PHP8 he will get a error message.

Steps to reproduce

• setup a server instance with php8.x
• setup a new joomla4 instance
• install helix 3
• set helix3 as default
• check the frontpage

Expected behavior

No error exception should be thrown.

Screenshots

Environment

• Ubuntu server minimal 20.04 LTS
• PHP 8.x
• Apache 2.4
• Mysql 5.x+
• Joomla 4