fixup! Ensure compatiblity with older pytest

Author: nicki-krizek

bin/tests/system/conftest.py

@@ -65,7 +65,7 @@ def control_port():
     # pylint: disable=redefined-outer-name
 
     # ----------------- Older pytest / xdist compatibility -------------------
-    # As of 2023-01-11, the minimal supported pytest / xdist version are
+    # As of 2023-01-11, the minimal supported pytest / xdist versions are
     # determined by what is available in EL8/EPEL8:
     # - pytest 3.4.2
     # - pytest-xdist 1.24.1