Fixes #621 - Adjusted required ruby version in prerequisites

Author: ralf401

Diff for: prerequisites/software.rst

@@ -81,7 +81,7 @@ different Zammad versions:
    :header: "Zammad", "Ruby"
    :widths: 20, 20
 
-   "6.5+", "3.2.7"
+   "6.5+", "3.2.8"
    "6.3.1 - 6.4", "3.2.4"
    "6.3.0", "3.2.3"
    "5.4 - 6.2", "3.1.3"