Update setup-python action to v5 #107

Job	Run time
base-images	19m 52s
lint	7s
app-images (nightly, pulp-minimal)	17m 26s
app-images (nightly, pulp)	32m 51s
app-images (nightly, galaxy-minimal)	11m 56s
app-images (nightly, galaxy)	14m 9s
app-images (stable, pulp-minimal)	11m 55s
app-images (stable, pulp)	32m 11s
app-images (stable, galaxy-minimal)	10m 43s
app-images (stable, galaxy)	12m 28s
	2h 43m 38s

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