Fix PytestDeprecationWarning

Current test warns:

    PytestDeprecationWarning: The --strict option is deprecated, use --strict-markers instead.

Marked as deprecated in pytest-dev/pytest#7985
Released in pytest 6.2.0

Signed-off-by: Mike Fiedler <miketheman@gmail.com>

bin/tests

@@ -33,6 +33,6 @@ fi
 set -x
 
 # Actually run our tests.
-python -m coverage run -m pytest --strict $COMMAND_ARGS
+python -m coverage run -m pytest --strict-markers $COMMAND_ARGS
 python -m coverage html
 python -m coverage report -m --fail-under 100