Add 25.04 upgrade notes

Author: badlop

content/admin/upgrade/index.md

@@ -92,6 +92,7 @@ of the new ejabberd version if you need to update those tables yourself manually
 The corresponsing ugprade notes are available in the release notes of each release,
 and also available in the [Archive](../../archive/index.md) section:
 
+- [Upgrading from ejabberd 25.03 to 25.04](../../archive/25.04/upgrade.md)
 - [Upgrading from ejabberd 24.12 to 25.03](../../archive/25.03/upgrade.md)
 - [Upgrading from ejabberd 24.10 to 24.12](../../archive/24.12/upgrade.md)
 - [Upgrading from ejabberd 24.07 to 24.10](../../archive/24.10/upgrade.md)

content/archive/25.04/upgrade.md

@@ -0,0 +1,5 @@
+# Upgrade to ejabberd 25.04
+
+If you are upgrading ejabberd from [25.03](../../archive/25.03/index.md) to 25.04, then there is no change required on your part.
+
+If you are upgrading from previous ejabberd versions, please review their corresponding upgrade notes.