Fix WordPress update not completing

I tried recently to update WordPress to release 6.3 but it was constantly failing in my setup with nginx/php-fpm7.4.

Easiest way to fix it is to find this part of your site config in nginx:

        location ~ \.php(?:$|/) {
                include snippets/fastcgi-php.conf;
                fastcgi_pass php;
        }

and append it with fastcgi timeout settings:

        location ~ \.php(?:$|/) {
                include snippets/fastcgi-php.conf;
                fastcgi_read_timeout 600;
                fastcgi_send_timeout 600;
                fastcgi_connect_timeout 600;
                fastcgi_pass php;
        }