fix(system-requirements): fix listing of supported postgres versions

Signed-off-by: Simon L. <szaimen@e.mail.de>

Author: szaimen

admin_manual/installation/system_requirements.rst

@@ -27,7 +27,7 @@ For best performance, stability and functionality we have documented some recomm
 |                  | - MariaDB 10.6 / 10.11 / 11.4 / **11.8** (recommended)                |
 |                  | - Oracle Database 19c, 21c, 23ai                                      |
 |                  |   (*only as part of an enterprise subscription*)                      |
-|                  | - PostgreSQL 14 / 14 / 15 / 16 / **18** (recommended)                 |
+|                  | - PostgreSQL 14 / 15 / 16 / 17 / **18** (recommended)                 |
 |                  | - SQLite 3.24+ (*only recommended for testing and minimal-instances*) |
 +------------------+-----------------------------------------------------------------------+
 | Webserver        | - **Apache 2.4 with** ``mod_php`` **or** ``php-fpm`` (recommended)    |