Update image caching for version builds #8

Job	Run time
Find latest pyenv version	5s
Build Python Builder Base	18s
Resolve Python Versions	26s
Build Python Versions (3.14, 3.14.0) / Build Python 3.14.0	2m 1s
Build Python Versions (3.13t, 3.13.9t) / Build Python 3.13.9t	2m 0s
Build Python Versions (3.14t, 3.14.0t) / Build Python 3.14.0t	2m 2s
Build Python Versions (3.14j, 3.14.0j) / Build Python 3.14.0j	2m 1s
	8m 53s

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