PHP 8.4+ problems

I have issues with PHP updates now after WP 7.1

Modula gives me this lines in debug. Please advice what to do.

[08-Sep-2026 12:14:26 UTC] PHP Deprecated: Parsedown::blockSetextHeader(): Implicitly marking parameter $Block as nullable is deprecated, the explicit nullable type must be used instead in /customers/0/c/b/goteborgsmagiskaklubb.se/httpd.www/wp-content/plugins/modula-best-grid-gallery/includes/libraries/parser/Parsedown.php on line 635
[08-Sep-2026 12:14:26 UTC] PHP Deprecated: Parsedown::blockTable(): Implicitly marking parameter $Block as nullable is deprecated, the explicit nullable type must be used instead in /customers/0/c/b/goteborgsmagiskaklubb.se/httpd.www/wp-content/plugins/modula-best-grid-gallery/includes/libraries/parser/Parsedown.php on line 751