Announcement Block update

Author: deadbytefpv

overrides/main.html

@@ -13,5 +13,5 @@
 />
 {% endblock %}
 {% block announce %}
-ExpressLRS v3.5.5 is out now! Check it out on <a href="https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.5">GitHub</a>.
+ExpressLRS v3.5.6 is out now! Check it out on <a href="https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.6">GitHub</a>.
 {% endblock %}