Test

Bump actions/cache to v4 (#1516) #1619

Job	Run time
Test Demo Relying Party (18.x)	17s
Test Package (Python 3.10, Django 4.2)	2m 30s
Test Demo Relying Party (20.x)	16s
Test Package (Python 3.10, Django 5.0)	2m 58s
Test Package (Python 3.10, Django 5.1)	3m 25s
Test Package (Python 3.10, Django main)	3m 58s
Test Package (Python 3.11, Django 4.2)	2m 31s
Test Package (Python 3.11, Django 5.0)	2m 52s
Test Package (Python 3.11, Django 5.1)	3m 20s
Test Package (Python 3.11, Django main)	3m 53s
Test Package (Python 3.12, Django 4.2)	2m 39s
Test Package (Python 3.12, Django 5.0)	3m 4s
Test Package (Python 3.12, Django 5.1)	3m 28s
Test Package (Python 3.12, Django main)	4m 4s
Test Package (Python 3.8, Django 4.2)	2m 30s
Test Package (Python 3.9, Django 4.2)	2m 31s
Test successful	1s
	44m 17s

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