Upgrade Wagtail to 6.1

[willbarton]

This PR upgrades us to Wagtail 6.1. The required changes are minor.

One thing to note, we still have a RemovedInWagtail70Warning: The usage of WidgetWithScript hook is deprecated. Use external scripts instead. warning that will be fixed by wagtail/wagtail-autocomplete#180 when (if?) it gets merged.

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)

[chosak]

The unittest failure in jobmanager can be reproduced locally by visiting http://localhost:8000/admin/snippets/jobmanager/region/. The issue seems to be this line. Here's a diff that fixes:

diff --git a/cfgov/jobmanager/models/django.py b/cfgov/jobmanager/models/django.py
index e83a6883c..4361f6867 100755
--- a/cfgov/jobmanager/models/django.py
+++ b/cfgov/jobmanager/models/django.py
@@ -92,6 +92,12 @@ class Region(ClusterableModel):
         InlinePanel("major_cities", label="Major cities"),
     ]
 
+    def states_in_region(self):
+        return ", ".join(str(state) for state in self.states.all())
+
+    def major_city_names(self):
+        return "; ".join(str(city) for city in self.major_cities.all())
+
 
 class State(models.Model):
     name = models.CharField(max_length=255)
diff --git a/cfgov/jobmanager/views.py b/cfgov/jobmanager/views.py
index 35e29f6d7..3b0afba27 100644
--- a/cfgov/jobmanager/views.py
+++ b/cfgov/jobmanager/views.py
@@ -48,13 +48,12 @@ class RegionViewSet(SnippetViewSet):
     icon = "site"
     menu_label = "Regions"
 
-    def states_in_region(self):
-        return ", ".join(str(state) for state in self.states.all())
-
-    def major_cities(self):
-        return "; ".join(str(city) for city in self.major_cities.all())
-
-    list_display = ["abbreviation", "name", states_in_region, major_cities]
+    list_display = [
+        "abbreviation",
+        "name",
+        "states_in_region",
+        "major_city_names",
+    ]
 
 
 class ServiceTypeViewSet(SnippetViewSet):

This was just changed by me as part of the 5.1 upgrade in #8075; I'm surprised this ever worked because according to the release notes specifying the callable directly was never supported.

[chosak]

LGTM!