update merch preorder deadline

Signed-off-by: Kim Brose <2803622+HarHarLinks@users.noreply.github.com>

Author: HarHarLinks

src/pages/register.astro

@@ -90,8 +90,7 @@ import Tickets from "../components/Tickets.astro";
                 </p>
                 <p>
                     The production timeline of physical items means that we
-                    can only take preorders until the end of the Early Bird
-                    sale end of May.
+                    can only take preorders until the end of July.
 
                     A limited stock of the same items will additionally
                     be available for sale on site.