update tests' README #909

Job	Run time
build (ubuntu-latest, 3.13, 8.1)	52s
build (ubuntu-latest, 3.9, 8.2)	50s
build (ubuntu-latest, 3.13, 8.2)	47s
build (ubuntu-22.04, 3.7, latest)	1m 5s
build (ubuntu-latest, 3.13, latest)	1m 4s
build (ubuntu-latest, 3.9, latest)	1m 6s
build (ubuntu-22.04, 3.7, 8.2)	53s
fossa-scan / Run fossa scan on repository	30s
build (ubuntu-22.04, 3.7, 8.1)	53s
build (ubuntu-latest, 3.9, 8.1)	48s
fossa-scan / Fetch fossa results	1m 7s
	9m 55s

Provide feedback