test: allow to run tests in parallel #203

Job	Run time
build (18.x, ubuntu-latest)	39s
build (18.x, windows-latest)	1m 20s
build (18.x, macos-latest)	26s
build (20.x, ubuntu-latest)	27s
build (20.x, windows-latest)	2m 1s
build (20.x, macos-latest)	29s
test_18 (18.x, macos-latest) / test	3m 2s
test_18 (18.x, ubuntu-latest) / test	3m 15s
test_18 (18.x, windows-latest) / test	4m 41s
test_18 (20.x, macos-latest) / test	2m 59s
test_18 (20.x, ubuntu-latest) / test	3m 9s
test_18 (20.x, windows-latest) / test	6m 39s
test_20 (18.x, macos-latest) / test	4m 32s
test_20 (18.x, ubuntu-latest) / test	3m 26s
test_20 (18.x, windows-latest) / test	5m 45s
test_20 (20.x, macos-latest) / test	3m 3s
test_20 (20.x, ubuntu-latest) / test	3m 1s
test_20 (20.x, windows-latest) / test	5m 6s
test_host (18.x, macos-latest) / test	5m 8s
test_host (18.x, windows-latest) / test	9m 50s
test_host (20.x, macos-latest) / test	7m 31s
test_host (18.x, ubuntu-latest) / test	5m 39s
test_host (20.x, ubuntu-latest) / test	5m 50s
test_host (20.x, windows-latest) / test	10m 21s
	1h 38m 19s

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