Skip NumberFormatTest#testMonetarySeparator on U or below am: 6d2364d5ea am: 921400dd8d am: 63e274aff3

Original change: https://android-review.googlesource.com/c/platform/external/icu/+/3125253

Change-Id: I487743619745b995de1e6b8926713dc1ad920a84
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>