Test against Wagtail 7.0 final

Author: Stormheg

tox.ini

@@ -25,7 +25,7 @@ deps =
     wagtail52: wagtail~=5.2.0
     wagtail63: wagtail~=6.3.0
     wagtail64: wagtail~=6.4.0
-    wagtail70: wagtail>=7.0rc1,<8.0
+    wagtail70: wagtail>=7.0.0,<7.1
 
     postgres: psycopg2>=2.9
 extras = testing