Only scan ./tests directory for tests #930

Job	Run time
build (ubuntu-latest, 3.9, 8.1)	7m 45s
fossa-scan / Run fossa scan on repository	35s
build (ubuntu-latest, 3.13, 8.2)	7m 34s
build (ubuntu-latest, 3.13, latest)	10m 52s
build (ubuntu-latest, 3.13, 8.1)	7m 43s
build (ubuntu-latest, 3.9, 8.2)	7m 38s
build (ubuntu-latest, 3.9, latest)	15m 53s
build (ubuntu-22.04, 3.7, 8.2)	7m 42s
build (ubuntu-22.04, 3.7, 8.1)	7m 54s
build (ubuntu-22.04, 3.7, latest)	12m 6s
fossa-scan / Fetch fossa results	1m 46s
build (ubuntu-latest, 3.9, 8.2)	7m 38s
build (ubuntu-22.04, 3.7, 8.1)	7m 54s
build (ubuntu-latest, 3.13, latest)	10m 52s
build (ubuntu-latest, 3.13, 8.1)	7m 43s
build (ubuntu-latest, 3.13, 8.2)	7m 34s
build (ubuntu-latest, 3.9, latest)	10m 37s
build (ubuntu-22.04, 3.7, latest)	12m 6s
fossa-scan / Fetch fossa results	1m 46s
build (ubuntu-22.04, 3.7, 8.2)	7m 42s
fossa-scan / Run fossa scan on repository	35s
build (ubuntu-latest, 3.9, 8.1)	7m 45s
	2h 49m 40s

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