Site technical problem – PHP update error triggered

Good morning

A few days ago I updated the PHP version on my server to the latest version. After that update I started getting an error message and couldn’t log into my admin panel and I received the following error message:

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.8
Current theme: GeneratePress (version 3.0.4)
Current plugin: Search Regex (version 2.4.1)
PHP version 8.0.3

Error Details
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An error of type E_PARSE was caused in line 322 of the file /home/************/public_html/wp-content/plugins/search-regex/models/search.php. Error message: syntax error, unexpected token "::", expecting "("

Could you please advise in the above and also let me know when the compatibility update will be released as I am still getting the WordPress plugin compatibility warning on the installed plugin page.

With many thanks in advance ~ have a nice day. ??