zabbix: add php8-mod-simplexml dependency to frontend

While the frontend can mostly operate without php8-mod-simplexml, when
trying to import XML templates the user only gets unhelpful error
messages and is unlikely to realize the module is required for that
functionality. Therefore have the frontend depend on php8-mod-simplexml.

Signed-off-by: Daniel F. Dickinson <dfdpublic@wildtechgarden.ca>

admin/zabbix/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zabbix
 PKG_VERSION:=7.0.28
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://cdn.zabbix.com/zabbix/sources/stable/$(basename $(PKG_VERSION))/ \
@@ -360,6 +360,7 @@ define Package/zabbix-frontend-server
     +php8-mod-mbstring \
     +php8-mod-openssl \
     +php8-mod-session \
+    +php8-mod-simplexml \
     +php8-mod-sockets \
     +php8-mod-xmlreader \
     +php8-mod-xmlwriter