Warning message on Yoast Duplicate Post

Hello there,

I was running a PHP Compatibility Checker before to update the latest version of Php.

I noticed that Yoast Duplicate Post is compatible but with one warning:

FILE: /home/609671.cloudwaysapps.com/vbfqzkhsjn/public_html/wp-content/plugins/duplicate-post/duplicate-post.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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70 | WARNING | Function name “__duplicate_post_main” is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
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Is it safe to update the PHP? Will cause problems with the ranking, SEO google, and website? How can I resolve the warning?

Thank you,
have a nice day
Fede