ICU-22707 adjust UTS46 for Unicode 16 #39

Job	Run time
clang-valgrind-intltest (utility)	6m 51s
clang-valgrind-intltest (normalize)	6m 33s
clang-valgrind-test	9m 58s
clang-valgrind-intltest (collator)	5m 10s
clang-valgrind-intltest (regex)	5m 24s
clang-valgrind-intltest (format)	16m 5s
clang-valgrind-intltest (translit)	6m 15s
clang-valgrind-intltest (rbbi)	7m 54s
clang-valgrind-intltest (rbnf)	6m 8s
clang-valgrind-intltest (rbnfrt)	5m 47s
clang-valgrind-intltest (icuserv)	5m 5s
clang-valgrind-intltest (idna)	5m 7s
clang-valgrind-intltest (convert)	6m 43s
clang-valgrind-intltest (rbnfp)	5m 29s
clang-valgrind-intltest (csdet)	5m 15s
clang-valgrind-intltest (spoof)	5m 12s
clang-valgrind-intltest (bidi)	5m 10s
	1h 54m 6s

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