docs: adding link to dec 2024 update

docs/product-and-design/newsletter-archive.md

@@ -2,7 +2,13 @@
 
 We send a newsletter in the first half of each month to share product updates, adoption metrics, and news related to Cal-ITP Benefits. Below is an archive of all newsletters we’ve shared organized by year and month.
 
-If you’re interested in receiving this update delivered directly to your email inbox, [subscribe here](https://share.hsforms.com/1uC9WaFRTQJOgZXEgplZrRQ3aanu?utm_source=hs_email&utm_medium=email&\_hsenc=p2ANqtz-83CN5gNFMDIl72kAgvLBPDaiYymXt4jVuntgiYzc3hwnvhlghSYQSOYZgY_Hbqew-LzXGA).
+If you’re interested in receiving this update delivered directly to your email inbox, [subscribe here](https://share.hsforms.com/1uC9WaFRTQJOgZXEgplZrRQ3aanu?utm_source=hs_email&utm_medium=email&_hsenc=p2ANqtz-83CN5gNFMDIl72kAgvLBPDaiYymXt4jVuntgiYzc3hwnvhlghSYQSOYZgY_Hbqew-LzXGA).
+
+<!--
+### 2025
+
+- [The January Update]()
+-->
 
 ### 2024
 
@@ -21,6 +27,5 @@ If you’re interested in receiving this update delivered directly to your email
 - [The October Update](http://5519226.hs-sites.com/cal-itp-benefits-the-october-update)
 
 - [The November Update](http://5519226.hs-sites.com/cal-itp-benefits-the-november-update)
-<!--
-- [The December Update]()
--->
+
+- [The December Update](https://5519226.hs-sites.com/cal-itp-benefits-the-december-update)