Test with Django 5.2.8, 5.1.14, and 4.2.26 (#1154)

Author: mbraak

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        django: ["django==4.2.25", "django==5.1.13", "django==5.2.7"]
+        django: ["django==4.2.26", "django==5.1.14", "django==5.2.8"]
 
     services:
       postgres: