PHP 8 support

Hi,

After updating our site to PHP 8 this plugin keeps erroring and stops all access to the website. Using plugin version 8.2.4 & WordPress version 5.9.2

Error output below:

2022/03/16 15:21:50 [error] 8707#8707: *316484 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught TypeError: Unsupported operand types: array + string in {SITE_ROOT}/www/wp-content/plugins/simple-share-buttons-adder/php/class-database.php:329
Stack trace:
#0 {SITE_ROOT}/www/wp-content/plugins/simple-share-buttons-adder/php/class-admin-bits.php(382): SimpleShareButtonsAdder\Database->upgrade_ssba()
#1 {SITE_ROOT}/www/wp-includes/class-wp-hook.php(305): SimpleShareButtonsAdder\Admin_Bits->ssba_menu()
#2 {SITE_ROOT}/www/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#3 {SITE_ROOT}/www/wp-includes/plugin.php(474): WP_Hook->do_action()
#4 {SITE_ROOT}/www/wp-admin/includes/menu.php(155): do_action()
#5 {SITE_ROOT}/www/wp-admin/menu.php(394): require_once('...')
#6 {SITE_ROOT}/www/wp-admin/admin.php(158): requir" while reading response header from upstream, client: 46.69.230.249, server: www.{SITE_URL}, request: "GET /wp-admin/plugins.php?activate=true&plugin_status=all&paged=1&s= HTTP/1.1", upstream: "fastcgi://unix:/var/run/php8.0-fpm-{SITE_USER}:", host: "{SITE_URL}", referrer: "http://{SITE_URL}/wp-admin/plugins.php"

Would be great if we could get this fixed please 🙂