Temporary workaround for NumberFormatTest#testMonetarySeparator

This test has started failing since the OpenJDK 17 text update. The
test covers a corner case so this is a temporary suppression instead
of a larger revert (pending a deeper investigation).

Bug: 263242417
Fix: 262959724
Test: atest CtsIcuTestCases:NumberFormatTest#testMonetarySeparator
Change-Id: Iab8979b611d26b290e39ec1621237aeca97daebb
1 file changed