Update RHCOS to OCP version map (#2826)

Co-authored-by: sebrandon1 <[email protected]>

Author: github-actions[bot]

tests/platform/operatingsystem/files/rhcos_version_map

@@ -508,6 +508,7 @@
 4.18.0-rc.7 / 418.94.202501281847-0
 4.18.0-rc.8 / 418.94.202502041521-0
 4.18.0-rc.9 / 418.94.202502100215-0
+4.18.1 / 418.94.202502100215-0
 4.4.0 / 44.81.202004260825-0
 4.4.0-rc.0 / 44.81.202003110830-0
 4.4.0-rc.1 / 44.81.202003130330-0