Update release-notes-v18.4.1.md

add note about pg_tde 2.2.0 working only with 18.4 no previous ver

Author: Andriciuc

docs/release-notes/release-notes-v18.4.1.md

@@ -8,6 +8,9 @@ This release of Percona Distribution for PostgreSQL is based on Percona Server f
 
 This release continues to deliver Percona’s open source value-add components for enterprise use cases, `pg_tde` 2.2.0 for Transparent Data Encryption and more. See the full component list below for details.
 
+!!! note
+    `pg_tde` 2.2.0 requires Percona Distribution for PostgreSQL 18.4 at minimum. Earlier versions of PPG are not supported with this release of `pg_tde`.
+
 To upgrade from earlier versions (e.g. Percona Distribution for PostgreSQL 17.x), follow the steps in [Upgrading Percona Distribution for PostgreSQL](../major-upgrade.md).
 
 !!! note