Test

Fix test for changed error message from newer Django (djmain) #1533

Job	Run time
Test Demo Relying Party (18.x)	22s
Test Package (Python 3.10, Django 4.2)	2m 29s
Test Demo Relying Party (20.x)	15s
Test Package (Python 3.10, Django 5.0)	2m 44s
Test Package (Python 3.10, Django 5.1)	3m 10s
Test Package (Python 3.10, Django main)	3m 51s
Test Package (Python 3.11, Django 4.2)	2m 24s
Test Package (Python 3.11, Django 5.0)	2m 48s
Test Package (Python 3.11, Django 5.1)	3m 7s
Test Package (Python 3.11, Django main)	3m 43s
Test Package (Python 3.12, Django 4.2)	2m 30s
Test Package (Python 3.12, Django 5.0)	2m 48s
Test Package (Python 3.12, Django 5.1)	3m 23s
Test Package (Python 3.12, Django main)	3m 49s
Test Package (Python 3.8, Django 4.2)	2m 23s
Test Package (Python 3.9, Django 4.2)	2m 21s
Test successful	1s
	42m 8s

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