#3501 doc: mention botan 3.11.0 change

Signed-off-by: Patrizio Bekerle <patrizio@bekerle.com>

Author: pbek

CHANGELOG.md

@@ -12,6 +12,8 @@
 - Added a search panel to the update dialog changelog so release note changes can
   be searched directly with the standard find workflow (for
   [#3498](https://github.com/pbek/QOwnNotes/issues/3498))
+- Prepare build process for system botan 3.11.0
+  (for [#3501](https://github.com/pbek/QOwnNotes/issues/3501), thank you @thillux)
 
 ## 26.3.11