Use the latest wagtailmenus

Author: nutjob4life

src/edrnsite.policy/setup.cfg

@@ -41,7 +41,7 @@ install_requires =
     wagtail-favicon       ~= 0.2.0
     wagtail-metadata      >= 4.0.1, <4.1
     tzdata                == 2022.1        # Must match py3-tz-2022.1 package installed in Dockerfile
-    wagtailmenus @ https://github.com/jazzband/wagtailmenus/archive/refs/tags/v3.1.2.zip
+    wagtailmenus          == 3.1.3
     wagtail-robots @ https://github.com/besarbertasholli/wagtail-robots/archive/refs/heads/master.zip