Add release note for encrypted SAML assertions in GitHub Enterprise Server 3.4.0 (github#26312)

Author: mattpollard

data/release-notes/enterprise-server/3-4/0.yml

@@ -33,6 +33,12 @@ sections:
         - |
           {% data variables.product.prodname_dependabot %} is now available in {% data variables.product.prodname_ghe_server %} 3.4 as a public beta, offering both version updates and security updates for several popular ecosystems. {% data variables.product.prodname_dependabot %} on {% data variables.product.prodname_ghe_server %} requires {% data variables.product.prodname_actions %} and a pool of self-hosted runners configured for {% data variables.product.prodname_dependabot %} use. {% data variables.product.prodname_dependabot %} on {% data variables.product.prodname_ghe_server %} also requires {% data variables.product.prodname_github_connect %} and {% data variables.product.prodname_dependabot %} to be enabled by an administrator. Beta feedback and suggestions can be shared in the [{% data variables.product.prodname_dependabot %} Feedback GitHub discussion](https://github.com/github/feedback/discussions/categories/dependabot-feedback). For more information and to try the beta, see "[Setting up {% data variables.product.prodname_dependabot %} security and version updates on your enterprise](/admin/github-actions/enabling-github-actions-for-github-enterprise-server/setting-up-dependabot-updates)."
 
+    - heading: SAML authentication supports encrypted assertions
+      notes:
+        # https://github.com/github/releases/issues/1946
+        - |
+          If you use SAML authentication for {% data variables.product.prodname_ghe_server %}, you can now configure encrypted assertions from your IdP to improve security. Encrypted assertions add an additional layer of encryption when your IdP transmits information to {% data variables.product.product_location %}. For more information, see "[Using SAML](/admin/identity-and-access-management/authenticating-users-for-your-github-enterprise-server-instance/using-saml#enabling-encrypted-assertions)."
+
   changes:
     - heading: Administration Changes
       notes: