Adjust matrix to proposed configuration #918

Job	Run time
build (ubuntu-latest, 3.13, latest)	11m 58s
fossa-scan / Run fossa scan on repository	2s
build (ubuntu-latest, 3.9, latest)	12m 12s
build (ubuntu-22.04, 3.7, 9.1)	12m 3s
build (ubuntu-latest, 3.9, 9.4)	12m 39s
fossa-scan / Fetch fossa results	0s
	48m 54s

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