[gnome-builder] meson-templates: use " instead of '

[Christian Hergert <chergert src gnome org>]

commit 7280030c3e23d05d8b5be458d7f55c4eccf1e41a
Author: Christian Hergert <chergert redhat com>
Date:   Sun Nov 28 11:02:57 2021 -0800

    meson-templates: use " instead of '

 src/plugins/meson-templates/resources/src/window-gtk4.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/plugins/meson-templates/resources/src/window-gtk4.ui 
b/src/plugins/meson-templates/resources/src/window-gtk4.ui
index 329af3f3a..f9a03a124 100644
--- a/src/plugins/meson-templates/resources/src/window-gtk4.ui
+++ b/src/plugins/meson-templates/resources/src/window-gtk4.ui
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <requires lib='gtk' version='4.0'/>
+  <requires lib="gtk" version="4.0"/>
   <template class="{{PreFix}}Window" parent="GtkApplicationWindow">
     <property name="default-width">600</property>
     <property name="default-height">300</property>