DBC22-6598: update wagtail to 7.4.1 (#1354)

Author: bcgov-brwang

src/backend/requirements/base.txt

@@ -12,7 +12,7 @@ huey==2.6.0
 markdown==3.6
 psycopg==3.1.9
 redis==4.5.5
-wagtail==7.3.2
+wagtail==7.4.1
 wagtail-modeladmin==2.2.0
 django-email-log==1.4.0
 pyodbc==5.2.0