Disable only plugin & theme update alert emails

Hi,

I saw related topics about my issue:

• https://ww.wp.xz.cn/support/topic/how-to-disable-plugin-update-alert-emails/
• https://ww.wp.xz.cn/support/topic/prevent-plugin-upgrade-notifications/

But I want to keep the severity level in Medium, as Medium level also include these alerts:

• Your site is running an unknown core version of WordPress
• Your site is running an older version of PHP (5.4 or below) that is incompatible with Wordfence country blocking
• An abandoned plugin is installed

Maybe a filter or constant to use to filter the severity levels, what to include or exclude? I really want to disable plugin and theme update notifications, but keep all other notification options as is.

Please consider to add this option as a checkbox or as a filter! Thank you!