Add release notes for FreeSWITCH v20.25.4 (#277)

Author: andywolk

docs/FreeSWITCH-Explained/Release-Notes/FreeSWITCH-Enterprise-Release-notes_61210814.mdx

@@ -4,6 +4,7 @@
 
 ### List of releases:
 
+* [20.25.4 (Release date: 27 Oct 2025)](#20254-release-date-27-oct-2025)
 * [20.25.3 (Release date: 12 Sep 2025)](#20253-release-date-12-sep-2025)
 * [20.25.2 (Release date: 18 Jun 2025)](#20252-release-date-18-jun-2025)
 * [20.25.1 (Release date: 20 Feb 2025)](#20251-release-date-20-feb-2025)
@@ -30,6 +31,17 @@
 
 Previous release notes are on the [SignalWire Stack Release notes](./SignalWire-Stack-Release-notes_19595529.mdx#list-of-releases) page.
 
+## 20.25.4 (Release date: 27 Oct 2025)
+
+This is an important release containing critical security fixes and stability improvements. We encourage all users to upgrade to v20.25.4 whenever possible.
+
+* **Tarball:** [Tarball](https://fsa.freeswitch.com/downloads/freeswitch-releases/freeswitch-20.25.4.-release.tar.gz)
+* **Packaging:** [Instructions](https://freeswitch.org/confluence/display/FREESWITCH/Installation), [FSGET](https://github.com/signalwire/freeswitch/tree/master/scripts/packaging)
+* **Windows:** [Windows](https://fsa.freeswitch.com/downloads/windows/x64/release/FreeSWITCH-20.25.4-Release-x64.msi)
+* **Windows Sound Packages:** [Sound Packages](http://files.freeswitch.org/windows/installer/x64/sounds/)
+* **Installation Instructions:** [Debian](../Installation/Linux/Debian_for_FreeSWITCH_Enterprise.mdx#about)
+* **Release Notes:** [FreeSWITCH Advantage v20.25.4 Release notes on GitHub](https://github.com/signalwire/stack/releases/tag/v20.25.4)
+
 ## 20.25.3 (Release date: 12 Sep 2025)
 
 This is a major release introducing critical security fixes, stability improvements and adding Debian 13 Trixie support.