Update default project settings to use STORAGES instead of STATICFILES_STORAGE

We've bumped the template's requirements to use Django >= 4.2, so STATICFILES_STORAGE is deprecated

wagtail/project_template/project_name/settings/base.py

@@ -137,17 +137,27 @@ STATICFILES_DIRS = [
     os.path.join(PROJECT_DIR, "static"),
 ]
 
-# ManifestStaticFilesStorage is recommended in production, to prevent outdated
-# JavaScript / CSS assets being served from cache (e.g. after a Wagtail upgrade).
-# See https://docs.djangoproject.com/en/{{ docs_version }}/ref/contrib/staticfiles/#manifeststaticfilesstorage
-STATICFILES_STORAGE = "django.contrib.staticfiles.storage.ManifestStaticFilesStorage"
-
 STATIC_ROOT = os.path.join(BASE_DIR, "static")
 STATIC_URL = "/static/"
 
 MEDIA_ROOT = os.path.join(BASE_DIR, "media")
 MEDIA_URL = "/media/"
 
+# Default storage settings, with the staticfiles storage updated.
+# See https://docs.djangoproject.com/en/{{ docs_version }}/ref/settings/#std-setting-STORAGES
+STORAGES = {
+    "default": {
+        "BACKEND": "django.core.files.storage.FileSystemStorage",
+    },
+    # ManifestStaticFilesStorage is recommended in production, to prevent
+    # outdated JavaScript / CSS assets being served from cache
+    # (e.g. after a Wagtail upgrade).
+    # See https://docs.djangoproject.com/en/{{ docs_version }}/ref/contrib/staticfiles/#manifeststaticfilesstorage
+    "staticfiles": {
+        "BACKEND": "django.contrib.staticfiles.storage.ManifestStaticFilesStorage",
+    },
+}
+
 
 # Wagtail settings