To update the Librem EC, follow the documented instructions: https://docs.puri.sm/Hardware/Librem_14/Maintenance/ec/upgrade.html
There are new features and bug fixes that are interesting such as keymap rebinding and a fix for batteries sometimes disappearing if they reached 100% charge.
Is there a way to receive email notifications of Librem-EC and PureBoot firmware releases?
Software App lists only OS updates, no firmware ones.
From
the simple answer would seem to be “no” in terms of anything automatic.
However there is a more general Purism newsletter that you can subscribe to. (You would just be relying on the possibility that someone thinks it worthwhile to include an article or item in the newsletter.)
And there is the RSS feed of blog articles and development reports that you can subscribe to. (Ditto. And I think there are many who feel that the blog articles have become AI-generated and so unlikely to include the notification that you seek.)
In any case, those are the three mechanisms that I am aware of.
There were no Purism newsletter or blog article about this EC release 
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There is a firmware category in this forum, but this post was not tagged for it…
I have no time to continuosly monitor this forum or changes in repository.
Since in PureOS there are no notifications about firmware updates, there should be a dedicated newsletter to this.