Test

Fix DeprecationWarnings by updating key type property usage in tests #1954

Job	Run time
Test Demo Relying Party (20.x)	19s
Test Demo Relying Party (18.x)	19s
Test Package (Python 3.10, Django 5.1)	3m 42s
Test Package (Python 3.10, Django 4.2)	2m 52s
Test Package (Python 3.10, Django main)	19s
Test Package (Python 3.10, Django 5.0)	3m 5s
Test Package (Python 3.11, Django 5.1)	10m 22s
Test Package (Python 3.11, Django 5.0)	3m 17s
Test Package (Python 3.11, Django 4.2)	2m 44s
Test Package (Python 3.11, Django main)	21s
Test Package (Python 3.12, Django 4.2)	2m 46s
Test Package (Python 3.12, Django 5.1)	3m 40s
Test Package (Python 3.12, Django 5.0)	3m 7s
Test Package (Python 3.12, Django main)	4m 58s
Test Package (Python 3.9, Django 4.2)	2m 40s
Test Package (Python 3.8, Django 4.2)	2m 44s
Test successful	4s
	47m 19s

Provide feedback