Merge pull request #7865 from nextcloud/backport/7860/stable22

[stable22] Remove iconv from required PHP modules

Author: MichaIng

admin_manual/installation/source_installation.rst

@@ -40,7 +40,6 @@ Required:
 * PHP module filter (only on Mageia and FreeBSD)
 * PHP module GD
 * PHP module hash (only on FreeBSD)
-* PHP module iconv
 * PHP module JSON
 * PHP module libxml (Linux package libxml2 must be >=2.7.0)
 * PHP module mbstring