Test

Fix test for changed error message from newer Django (djmain) #1529

Job	Run time
Test Demo Relying Party (18.x)	14s
Test Package (Python 3.10, Django 4.2)	2m 25s
Test Demo Relying Party (20.x)	13s
Test Package (Python 3.10, Django 5.0)	2m 46s
Test Package (Python 3.10, Django 5.1)	3m 14s
Test Package (Python 3.10, Django main)	3m 47s
Test Package (Python 3.11, Django 4.2)	2m 23s
Test Package (Python 3.11, Django 5.0)	2m 43s
Test Package (Python 3.11, Django 5.1)	3m 15s
Test Package (Python 3.11, Django main)	3m 43s
Test Package (Python 3.12, Django 4.2)	2m 28s
Test Package (Python 3.12, Django 5.0)	2m 48s
Test Package (Python 3.12, Django 5.1)	3m 14s
Test Package (Python 3.12, Django main)	3m 49s
Test Package (Python 3.8, Django 4.2)	2m 26s
Test Package (Python 3.9, Django 4.2)	2m 26s
Test successful	1s
	41m 55s

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