ARMI unit tests

Unpin the max `matplotlib` version, which upgrades numpy #7724

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Run time

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Job	Run time
build (3.9)	7m 12s
build (3.10)	7m 20s
build (3.11)	6m 49s
build (3.12)	7m 12s
build (3.13)	7m 7s
	35m 40s