Update backoffice submodule with hotfix for breaking change that broke forms.

Migaroez · Migaroez · commit 1b21caa20ac9 · 2024-08-22T12:14:43.000+02:00
diff --git a/src/Umbraco.Web.UI.Client b/src/Umbraco.Web.UI.Client
@@ -1 +1 @@
-Subproject commit d52d9c70bff68fab77412c539b99a0e91a9dbe7c
+Subproject commit a9d3a4396968e4cc47c1d1cd290ca8b1cf764e12
