Fix #153 turn off summaries for pytest < 7.3
Summaries depend on internals of pytest, which changed in 7.3.
May be possible to back port, but the quickest fix is to turn them off for earlier pytest versions (7.0.0 - 7.2.2)
Example: Before 7.3:
=========== short test summary info ===========
FAILED test_example_simple.py::test_fail
Example after 7.3:
=========== short test summary info ===========
FAILED test_example_simple.py::test_fail - assert 1 == 2