Only scan ./tests directory for tests #929

Job	Run time
fossa-scan / Run fossa scan on repository	32s
build (ubuntu-latest, 3.9, 8.2)	7m 29s
build (ubuntu-latest, 3.9, 8.1)	7m 42s
build (ubuntu-22.04, 3.7, 8.1)	7m 51s
build (ubuntu-22.04, 3.7, latest)	13m 5s
build (ubuntu-latest, 3.13, 8.2)	7m 39s
build (ubuntu-latest, 3.13, latest)	11m 37s
build (ubuntu-latest, 3.9, latest)	10m 42s
build (ubuntu-latest, 3.13, 8.1)	7m 41s
build (ubuntu-22.04, 3.7, 8.2)	7m 44s
fossa-scan / Fetch fossa results	4m 11s
	1h 26m 13s

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