Use method_decorator for Page.serve cache_control

This is a change from Django 4.1

wagtailio/urls.py

@@ -18,7 +18,10 @@
 from wagtailio.newsletter.feeds import NewsLetterIssuesFeed
 from wagtailio.search.views import search
 from wagtailio.sitewide_alert import urls as sitewide_alert_urls
-from wagtailio.utils.cache import get_default_cache_control_decorator
+from wagtailio.utils.cache import (
+    get_default_cache_control_decorator,
+    get_default_cache_control_method_decorator,
+)
 from wagtailio.utils.sitemap_generator import Sitemap
 from wagtailio.utils.views import error_404, error_500, favicon, robots
 
@@ -40,7 +43,7 @@
 ]
 
 
-Page.serve = get_default_cache_control_decorator()(Page.serve)
+Page.serve = get_default_cache_control_method_decorator(Page.serve)
 
 
 if settings.DEBUG:

wagtailio/utils/cache.py

@@ -1,4 +1,5 @@
 from django.conf import settings
+from django.utils.decorators import method_decorator
 from django.views.decorators.cache import cache_control
 
 
@@ -18,3 +19,11 @@ def get_default_cache_control_kwargs():
 def get_default_cache_control_decorator():
     cache_control_kwargs = get_default_cache_control_kwargs()
     return cache_control(**cache_control_kwargs)
+
+
+def get_default_cache_control_method_decorator(original_method):
+    @method_decorator(get_default_cache_control_decorator())
+    def decorated_method(self, *args, **kwargs):
+        return original_method(self, *args, **kwargs)
+
+    return decorated_method