Test

Bump actions/cache to v4 #1617

Job	Run time
Test Demo Relying Party (18.x)	14s
Test Package (Python 3.10, Django 4.2)	2m 40s
Test Demo Relying Party (20.x)	16s
Test Package (Python 3.10, Django 5.0)	2m 56s
Test Package (Python 3.10, Django 5.1)	3m 26s
Test Package (Python 3.10, Django main)	4m 4s
Test Package (Python 3.11, Django 4.2)	2m 33s
Test Package (Python 3.11, Django 5.0)	2m 57s
Test Package (Python 3.11, Django 5.1)	3m 26s
Test Package (Python 3.11, Django main)	3m 59s
Test Package (Python 3.12, Django 4.2)	2m 40s
Test Package (Python 3.12, Django 5.0)	2m 58s
Test Package (Python 3.12, Django 5.1)	3m 26s
Test Package (Python 3.12, Django main)	4m 0s
Test Package (Python 3.8, Django 4.2)	2m 29s
Test Package (Python 3.9, Django 4.2)	2m 32s
Test successful	1s
	44m 37s

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