Update API version to 6
Update API version to 6

API 6 was added to CarAppApiLevels in aosp/2175708

Test: No logical changes
Bug: 241461401
Change-Id: I9fe1d275fa1727f1a7cc6b20baf1ddbd4d29890c

AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx