Match fragment-ktx dependency in preference-ktx
Match fragment-ktx dependency in preference-ktx

preference-ktx should depend on the same version of
fragment-ktx as preference depends on for fragment - the
latest stable.

Change-Id: Iad6db314f4122dad091a261c4b5167eefa1e21c4
Test: ./gradlew bOS

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